diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.cpp b/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.cpp
index 48ca34ad14424c64e5b71d9d3dba69a90d53da34..f528f7438f0c9131e6fac8604e5fd252cb5b6209 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.cpp
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.cpp
@@ -80,11 +80,6 @@ bool AutotoolsProjectFile::isModified() const
     return false;
 }
 
-bool AutotoolsProjectFile::isReadOnly() const
-{
-    return true;
-}
-
 bool AutotoolsProjectFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.h b/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.h
index 4bc6c1bb6a93c0e6d7493d41c417854027de403b..9f7750a11c01d7bbbe3454a8b721a832e3b6facc 100644
--- a/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.h
+++ b/src/plugins/autotoolsprojectmanager/autotoolsprojectfile.h
@@ -65,7 +65,6 @@ public:
     QString suggestedFileName() const;
     QString mimeType() const;
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
     void rename(const QString &newName);
diff --git a/src/plugins/bineditor/bineditorplugin.cpp b/src/plugins/bineditor/bineditorplugin.cpp
index 1625af74b6c288208703e89bb4a8c1f6bc59aac4..b646a0da99f72d0d1f36716e4d6473f9061854a8 100644
--- a/src/plugins/bineditor/bineditorplugin.cpp
+++ b/src/plugins/bineditor/bineditorplugin.cpp
@@ -297,7 +297,7 @@ public:
     bool isModified() const { return m_editor->isMemoryView() ? false : m_editor->isModified(); }
 
     bool isReadOnly() const {
-        if (m_editor->isMemoryView())
+        if (m_editor->isMemoryView() || m_fileName.isEmpty())
             return false;
         const QFileInfo fi(m_fileName);
         return !fi.isWritable();
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.cpp b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
index f7ba1e50736a49dbb73e013f4b6210eb8ed77961..202a6dd174806a1a0cb3bede2468d43a75d6995f 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
@@ -780,11 +780,6 @@ bool CMakeFile::isModified() const
     return false;
 }
 
-bool CMakeFile::isReadOnly() const
-{
-    return true;
-}
-
 bool CMakeFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.h b/src/plugins/cmakeprojectmanager/cmakeproject.h
index bad6d3c2d0e51a1c0c850d266f3e19f82ec4081b..1fe60a1c1d34a6c4b16b6879be3b7b064e8c9824 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.h
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.h
@@ -207,7 +207,6 @@ public:
     QString mimeType() const;
 
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/coreplugin/editormanager/openeditorsmodel.cpp b/src/plugins/coreplugin/editormanager/openeditorsmodel.cpp
index 496fbe801c795e0efeeadb1f27dcdeb5fab03b9e..cdd6f36c917ad03805f7b1a920951ec86b6d11f9 100644
--- a/src/plugins/coreplugin/editormanager/openeditorsmodel.cpp
+++ b/src/plugins/coreplugin/editormanager/openeditorsmodel.cpp
@@ -311,12 +311,15 @@ QVariant OpenEditorsModel::data(const QModelIndex &index, int role) const
                 : e.displayName();
     case Qt::DecorationRole:
     {
-        bool readOnly = false;
-        if (e.editor)
-            readOnly = e.editor->file()->isReadOnly();
-        else
-            readOnly = !QFileInfo(e.m_fileName).isWritable();
-        return readOnly ? d->m_lockedIcon : QIcon();
+        bool showLock = false;
+        if (e.editor) {
+            showLock = e.editor->file()->fileName().isEmpty()
+                    ? false
+                    : e.editor->file()->isReadOnly();
+        } else {
+            showLock = !QFileInfo(e.m_fileName).isWritable();
+        }
+        return showLock ? d->m_lockedIcon : QIcon();
     }
     case Qt::ToolTipRole:
         return e.fileName().isEmpty()
diff --git a/src/plugins/coreplugin/editormanager/openeditorswindow.cpp b/src/plugins/coreplugin/editormanager/openeditorswindow.cpp
index bd71b76c670375b5c837b186bf29ab6baacf1a9a..d5074e440c8a8add959064388298308e87fbc8cb 100644
--- a/src/plugins/coreplugin/editormanager/openeditorswindow.cpp
+++ b/src/plugins/coreplugin/editormanager/openeditorswindow.cpp
@@ -213,7 +213,8 @@ void OpenEditorsWindow::setEditors(EditorView *mainView, EditorView *view, OpenE
         QTreeWidgetItem *item = new QTreeWidgetItem();
         if (hi.file->isModified())
             title += tr("*");
-        item->setIcon(0, hi.file->isReadOnly() ? model->lockedIcon() : m_emptyIcon);
+        item->setIcon(0, !hi.file->fileName().isEmpty() && hi.file->isReadOnly()
+                      ? model->lockedIcon() : m_emptyIcon);
         item->setText(0, title);
         item->setToolTip(0, hi.file->fileName());
         item->setData(0, Qt::UserRole, QVariant::fromValue(hi.file.data()));
@@ -240,7 +241,8 @@ void OpenEditorsWindow::setEditors(EditorView *mainView, EditorView *view, OpenE
             QString title = model->displayNameForFile(hi.file);
             if (hi.file->isModified())
                 title += tr("*");
-            item->setIcon(0, hi.file->isReadOnly() ? model->lockedIcon() : m_emptyIcon);
+            item->setIcon(0, !hi.file->fileName().isEmpty() && hi.file->isReadOnly()
+                          ? model->lockedIcon() : m_emptyIcon);
             item->setText(0, title);
             item->setToolTip(0, hi.file->fileName());
             item->setData(0, Qt::UserRole, QVariant::fromValue(hi.file.data()));
diff --git a/src/plugins/coreplugin/editortoolbar.cpp b/src/plugins/coreplugin/editortoolbar.cpp
index 9c77a61305c1a3808cc37cd999eab12a6e95d872..66fc23b3d2a3174af18091213921512260dd7abe 100644
--- a/src/plugins/coreplugin/editortoolbar.cpp
+++ b/src/plugins/coreplugin/editortoolbar.cpp
@@ -400,9 +400,13 @@ void EditorToolBar::updateEditorStatus(IEditor *editor)
 
     d->m_editorList->setCurrentIndex(d->m_editorsListModel->indexOf(editor).row());
 
-    if (editor->file()->isReadOnly()) {
+    if (editor->file()->fileName().isEmpty()) {
+        d->m_lockButton->setIcon(QIcon());
+        d->m_lockButton->setEnabled(false);
+        d->m_lockButton->setToolTip(QString());
+    } else if (editor->file()->isReadOnly()) {
         d->m_lockButton->setIcon(QIcon(d->m_editorsListModel->lockedIcon()));
-        d->m_lockButton->setEnabled(!editor->file()->fileName().isEmpty());
+        d->m_lockButton->setEnabled(true);
         d->m_lockButton->setToolTip(tr("Make Writable"));
     } else {
         d->m_lockButton->setIcon(QIcon(d->m_editorsListModel->unlockedIcon()));
diff --git a/src/plugins/coreplugin/filemanager.cpp b/src/plugins/coreplugin/filemanager.cpp
index 982d0c4d3c89ff52cddf4fcde057ddc681a73e45..09791842983ca0dc9b2fe366eea8db56f8b719e5 100644
--- a/src/plugins/coreplugin/filemanager.cpp
+++ b/src/plugins/coreplugin/filemanager.cpp
@@ -607,10 +607,10 @@ static QList<IFile *> saveModifiedFilesHelper(const QList<IFile *> &files,
             if (name.isEmpty())
                 name = file->suggestedFileName();
 
-            // There can be several FileInterfaces pointing to the same file
-            // Select one that is not readonly.
-            if (!(modifiedFilesMap.key(name, 0)
-                    && file->isReadOnly()))
+            // There can be several IFiles pointing to the same file
+            // Prefer one that is not readonly
+            // (even though it *should* not happen that the IFiles are inconsistent with readonly)
+            if (!modifiedFilesMap.key(name, 0) || !file->isReadOnly())
                 modifiedFilesMap.insert(file, name);
         }
     }
diff --git a/src/plugins/coreplugin/ifile.cpp b/src/plugins/coreplugin/ifile.cpp
index 1badff4648414eea90dd15bbcf96a44f5df216fd..f88d0c60fdf0eae209a24d07616338a49d0d4f1b 100644
--- a/src/plugins/coreplugin/ifile.cpp
+++ b/src/plugins/coreplugin/ifile.cpp
@@ -35,6 +35,7 @@
 #include "infobar.h"
 
 #include <QtCore/QFile>
+#include <QtCore/QFileInfo>
 
 namespace Core {
 
@@ -66,6 +67,13 @@ bool IFile::shouldAutoSave() const
     return false;
 }
 
+bool IFile::isReadOnly() const
+{
+    if (fileName().isEmpty())
+        return false;
+    return !QFileInfo(fileName()).isWritable();
+}
+
 bool IFile::autoSave(QString *errorString, const QString &fileName)
 {
     if (!save(errorString, fileName, true))
diff --git a/src/plugins/coreplugin/ifile.h b/src/plugins/coreplugin/ifile.h
index 0d62419694953a4e03b52a287a08f939f6516484..58baf35f59e583a8fd69330ebd820c51d8759620 100644
--- a/src/plugins/coreplugin/ifile.h
+++ b/src/plugins/coreplugin/ifile.h
@@ -93,7 +93,7 @@ public:
 
     virtual bool shouldAutoSave() const;
     virtual bool isModified() const = 0;
-    virtual bool isReadOnly() const = 0;
+    virtual bool isReadOnly() const;
     virtual bool isSaveAsAllowed() const = 0;
 
     virtual ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/designer/formwindowfile.cpp b/src/plugins/designer/formwindowfile.cpp
index 6488438c255cee89392ee000ab163edde711b2d5..3defd2c1a655d5a5f51f96c27c45e3386ade9a6f 100644
--- a/src/plugins/designer/formwindowfile.cpp
+++ b/src/plugins/designer/formwindowfile.cpp
@@ -137,14 +137,6 @@ bool FormWindowFile::isModified() const
     return m_formWindow && m_formWindow->isDirty();
 }
 
-bool FormWindowFile::isReadOnly() const
-{
-    if (m_fileName.isEmpty())
-        return false;
-    const QFileInfo fi(m_fileName);
-    return !fi.isWritable();
-}
-
 bool FormWindowFile::isSaveAsAllowed() const
 {
     return true;
diff --git a/src/plugins/designer/formwindowfile.h b/src/plugins/designer/formwindowfile.h
index a85d8c5b4fad882881908a21faa561139f09cd0a..eb58152884dc9b8f80d43b0e98e4085388537783 100644
--- a/src/plugins/designer/formwindowfile.h
+++ b/src/plugins/designer/formwindowfile.h
@@ -57,7 +57,6 @@ public:
     virtual QString fileName() const;
     virtual bool shouldAutoSave() const;
     virtual bool isModified() const;
-    virtual bool isReadOnly() const;
     virtual bool isSaveAsAllowed() const;
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
     virtual QString defaultPath() const;
diff --git a/src/plugins/genericprojectmanager/genericproject.cpp b/src/plugins/genericprojectmanager/genericproject.cpp
index 0572678409ddf0a90381866e50ecd2b077d8bc57..2d0b53a5c428d160c9d290a23d587b9d5555846d 100644
--- a/src/plugins/genericprojectmanager/genericproject.cpp
+++ b/src/plugins/genericprojectmanager/genericproject.cpp
@@ -639,11 +639,6 @@ bool GenericProjectFile::isModified() const
     return false;
 }
 
-bool GenericProjectFile::isReadOnly() const
-{
-    return true;
-}
-
 bool GenericProjectFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/genericprojectmanager/genericproject.h b/src/plugins/genericprojectmanager/genericproject.h
index 80df0d566a7dfb711e60fd0cddb5c42d0db30c0a..6e845f02e842e50a58376519f053b3e8b44d3840 100644
--- a/src/plugins/genericprojectmanager/genericproject.h
+++ b/src/plugins/genericprojectmanager/genericproject.h
@@ -172,7 +172,6 @@ public:
     virtual QString mimeType() const;
 
     virtual bool isModified() const;
-    virtual bool isReadOnly() const;
     virtual bool isSaveAsAllowed() const;
     virtual void rename(const QString &newName);
 
diff --git a/src/plugins/imageviewer/imageviewerfile.cpp b/src/plugins/imageviewer/imageviewerfile.cpp
index b55a654842fb40f94a036c4169ec1d3399f90f41..03cbc2e3f8a9b7dd36120548907440771b64bb5d 100644
--- a/src/plugins/imageviewer/imageviewerfile.cpp
+++ b/src/plugins/imageviewer/imageviewerfile.cpp
@@ -116,11 +116,6 @@ bool ImageViewerFile::isModified() const
     return false;
 }
 
-bool ImageViewerFile::isReadOnly() const
-{
-    return true;
-}
-
 bool ImageViewerFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/imageviewer/imageviewerfile.h b/src/plugins/imageviewer/imageviewerfile.h
index fa4f08905dc443f479e682070f84097ff0786685..631e2bec86f8328c0dbd4c9bc0e988221795fb48 100644
--- a/src/plugins/imageviewer/imageviewerfile.h
+++ b/src/plugins/imageviewer/imageviewerfile.h
@@ -59,7 +59,6 @@ public:
     QString mimeType() const;
 
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
 
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
diff --git a/src/plugins/madde/maemoglobal.h b/src/plugins/madde/maemoglobal.h
index b46c2eb515d55e956284e3766a34cff0e270e19c..5835e3f1bcc233ed44a358e6aede76ed4d3441a1 100644
--- a/src/plugins/madde/maemoglobal.h
+++ b/src/plugins/madde/maemoglobal.h
@@ -69,7 +69,6 @@ public:
     QString suggestedFileName() const { return QString(); }
     QString mimeType() const { return QLatin1String("text/plain"); }
     bool isModified() const { return false; }
-    bool isReadOnly() const { return false; }
     bool isSaveAsAllowed() const { return false; }
     ReloadBehavior reloadBehavior(ChangeTrigger, ChangeType) const { return BehaviorSilent; }
     bool reload(QString *, ReloadFlag, ChangeType) { emit modified(); return true; }
diff --git a/src/plugins/projectexplorer/projectexplorer.cpp b/src/plugins/projectexplorer/projectexplorer.cpp
index 717a9194652f315c81fa749ad7a4c2e46db174dd..cc6493560b49ae348fa7628ae15fcf6796169a20 100644
--- a/src/plugins/projectexplorer/projectexplorer.cpp
+++ b/src/plugins/projectexplorer/projectexplorer.cpp
@@ -1078,16 +1078,8 @@ void ProjectExplorerPlugin::unloadProject()
 
     QList<Core::IFile*> filesToSave;
     filesToSave << fi;
-
-    // check the number of modified files
-    int readonlycount = 0;
-    foreach (const Core::IFile *file, filesToSave) {
-        if (file->isReadOnly())
-            ++readonlycount;
-    }
-
     bool success = false;
-    if (readonlycount > 0)
+    if (fi->isReadOnly())
         success = Core::FileManager::saveModifiedFiles(filesToSave).isEmpty();
     else
         success = Core::FileManager::saveModifiedFilesSilently(filesToSave).isEmpty();
diff --git a/src/plugins/qmlprojectmanager/qmlprojectfile.cpp b/src/plugins/qmlprojectmanager/qmlprojectfile.cpp
index d7aba905f84e7b6bae4dd867534b60d97fdb37d2..af3ca30f86c8f87486006af9fa40b48a36bf57c9 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectfile.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectfile.cpp
@@ -88,11 +88,6 @@ bool QmlProjectFile::isModified() const
     return false;
 }
 
-bool QmlProjectFile::isReadOnly() const
-{
-    return true;
-}
-
 bool QmlProjectFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/qmlprojectmanager/qmlprojectfile.h b/src/plugins/qmlprojectmanager/qmlprojectfile.h
index 4e143edd169ec6bb0bbaee67dd1a779415af222c..deb117d9f05a782adbb4adb9ec422cdc761b56a3 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectfile.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectfile.h
@@ -58,7 +58,6 @@ public:
     virtual QString mimeType() const;
 
     virtual bool isModified() const;
-    virtual bool isReadOnly() const;
     virtual bool isSaveAsAllowed() const;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/qt4projectmanager/qt4nodes.cpp b/src/plugins/qt4projectmanager/qt4nodes.cpp
index e20653d7989bdceabbf4b635aa641e234da484a1..ae95dffcce4c485d406213434279ce2aada3681a 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.cpp
+++ b/src/plugins/qt4projectmanager/qt4nodes.cpp
@@ -211,11 +211,6 @@ bool Qt4PriFile::isModified() const
     return false;
 }
 
-bool Qt4PriFile::isReadOnly() const
-{
-    return false;
-}
-
 bool Qt4PriFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/qt4projectmanager/qt4nodes.h b/src/plugins/qt4projectmanager/qt4nodes.h
index eeeb52c8f9c9f3e62c1ab4844f2a38966db86887..cb25e4e13cf378fc74c1bf11716cff32472b23c5 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.h
+++ b/src/plugins/qt4projectmanager/qt4nodes.h
@@ -230,7 +230,6 @@ public:
     virtual QString mimeType() const;
 
     virtual bool isModified() const;
-    virtual bool isReadOnly() const;
     virtual bool isSaveAsAllowed() const;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/qt4projectmanager/qt4project.cpp b/src/plugins/qt4projectmanager/qt4project.cpp
index 298a44bb35f0686b5c793f90a0e18af217967546..29d4fc2088c79793d6c736c38c4bedcb4534ed91 100644
--- a/src/plugins/qt4projectmanager/qt4project.cpp
+++ b/src/plugins/qt4projectmanager/qt4project.cpp
@@ -97,7 +97,6 @@ public:
     virtual QString mimeType() const;
 
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
@@ -283,12 +282,6 @@ bool Qt4ProjectFile::isModified() const
     return false; // we save after changing anyway
 }
 
-bool Qt4ProjectFile::isReadOnly() const
-{
-    QFileInfo fi(m_filePath);
-    return !fi.isWritable();
-}
-
 bool Qt4ProjectFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/resourceeditor/resourceeditorw.cpp b/src/plugins/resourceeditor/resourceeditorw.cpp
index 4dd9ea34c0e124e8947d9ddebb2418ac9840de72..97d02941f8adbbf70ba2dc2d9cc0a0e49f20dbf7 100644
--- a/src/plugins/resourceeditor/resourceeditorw.cpp
+++ b/src/plugins/resourceeditor/resourceeditorw.cpp
@@ -218,15 +218,6 @@ bool ResourceEditorFile::isModified() const
     return m_parent->m_resourceEditor->isDirty();
 }
 
-bool ResourceEditorFile::isReadOnly() const
-{
-    const QString fileName = m_parent->m_resourceEditor->fileName();
-    if (fileName.isEmpty())
-        return false;
-    const QFileInfo fi(fileName);
-    return !fi.isWritable();
-}
-
 bool ResourceEditorFile::isSaveAsAllowed() const
 {
     return true;
diff --git a/src/plugins/resourceeditor/resourceeditorw.h b/src/plugins/resourceeditor/resourceeditorw.h
index ac2cd0a58914ac43b587a86a6a9ded99dd82b25c..d84060c062cdd2e7ef8874e3b16eea8415e6cfcc 100644
--- a/src/plugins/resourceeditor/resourceeditorw.h
+++ b/src/plugins/resourceeditor/resourceeditorw.h
@@ -65,7 +65,6 @@ public:
     QString fileName() const;
     bool shouldAutoSave() const;
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
     bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
     QString defaultPath() const;
diff --git a/src/plugins/tasklist/taskfile.cpp b/src/plugins/tasklist/taskfile.cpp
index b0d3edb481957f55ff9e048e5a83053dde31ddbd..186dd5f9bdaab7b886afcf1e755bcfb55f516a2a 100644
--- a/src/plugins/tasklist/taskfile.cpp
+++ b/src/plugins/tasklist/taskfile.cpp
@@ -81,11 +81,6 @@ bool TaskFile::isModified() const
     return false;
 }
 
-bool TaskFile::isReadOnly() const
-{
-    return true;
-}
-
 bool TaskFile::isSaveAsAllowed() const
 {
     return false;
diff --git a/src/plugins/tasklist/taskfile.h b/src/plugins/tasklist/taskfile.h
index a4dcdf5aa2fd26c668955de2b771ab29d3ced7ea..135e9e4bb1e2fcea7d06c01b9d4e0d1d50ba648d 100644
--- a/src/plugins/tasklist/taskfile.h
+++ b/src/plugins/tasklist/taskfile.h
@@ -56,7 +56,6 @@ public:
     QString mimeType() const;
 
     bool isModified() const;
-    bool isReadOnly() const;
     bool isSaveAsAllowed() const;
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/texteditor/basetextdocument.cpp b/src/plugins/texteditor/basetextdocument.cpp
index 374f721472da909405900f549cf56981ab9b8c5b..4f6f4c1c7d24e5a791be53b71546f4197995496e 100644
--- a/src/plugins/texteditor/basetextdocument.cpp
+++ b/src/plugins/texteditor/basetextdocument.cpp
@@ -411,8 +411,6 @@ void BaseTextDocument::rename(const QString &newName)
 
 bool BaseTextDocument::isReadOnly() const
 {
-    if (hasDecodingError())
-        return true;
     if (d->m_fileName.isEmpty()) //have no corresponding file, so editing is ok
         return false;
     return d->m_fileIsReadOnly;
diff --git a/src/plugins/vcsbase/submiteditorfile.h b/src/plugins/vcsbase/submiteditorfile.h
index 4a64b33c95ad682579513665a8932e7162613fc7..6dd5ae35b462a97d2cae0873a6cc448bc79769d3 100644
--- a/src/plugins/vcsbase/submiteditorfile.h
+++ b/src/plugins/vcsbase/submiteditorfile.h
@@ -51,7 +51,6 @@ public:
 
     bool isModified() const { return m_modified; }
     QString mimeType() const;
-    bool isReadOnly() const { return false; }
     bool isSaveAsAllowed() const { return false; }
     bool save(QString *errorString, const QString &fileName, bool autoSave);
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
diff --git a/src/plugins/vcsbase/vcsbase.pro b/src/plugins/vcsbase/vcsbase.pro
index e3446c627bab101900ee0b4fdee9ca6735cdbb0e..5c377dc70e2bd570134b2bfd0849d55610bc3116 100644
--- a/src/plugins/vcsbase/vcsbase.pro
+++ b/src/plugins/vcsbase/vcsbase.pro
@@ -11,7 +11,6 @@ HEADERS += vcsbase_global.h \
     vcsbaseplugin.h \
     baseannotationhighlighter.h \
     diffhighlighter.h \
-    vcsbasetextdocument.h \
     vcsbaseeditor.h \
     vcsbasesubmiteditor.h \
     basevcseditorfactory.h \
@@ -40,7 +39,6 @@ SOURCES += vcsplugin.cpp \
     corelistener.cpp \
     baseannotationhighlighter.cpp \
     diffhighlighter.cpp \
-    vcsbasetextdocument.cpp \
     vcsbaseeditor.cpp \
     vcsbasesubmiteditor.cpp \
     basevcseditorfactory.cpp \
diff --git a/src/plugins/vcsbase/vcsbaseeditor.cpp b/src/plugins/vcsbase/vcsbaseeditor.cpp
index b669e5ee9eabb8a35ce3e7b2a9419ded38e84c2e..c3e688406d8aaf621b1450c870df34a4189514b7 100644
--- a/src/plugins/vcsbase/vcsbaseeditor.cpp
+++ b/src/plugins/vcsbase/vcsbaseeditor.cpp
@@ -33,7 +33,6 @@
 #include "vcsbaseeditor.h"
 #include "diffhighlighter.h"
 #include "baseannotationhighlighter.h"
-#include "vcsbasetextdocument.h"
 #include "vcsbaseconstants.h"
 #include "vcsbaseoutputwindow.h"
 #include "vcsbaseplugin.h"
@@ -50,6 +49,7 @@
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/session.h>
+#include <texteditor/basetextdocument.h>
 #include <texteditor/basetextdocumentlayout.h>
 #include <texteditor/fontsettings.h>
 #include <texteditor/texteditorconstants.h>
@@ -663,7 +663,6 @@ VcsBaseEditorWidget::VcsBaseEditorWidget(const VcsBaseEditorParameters *type, QW
     d(new Internal::VcsBaseEditorWidgetPrivate(this, type))
 {
     viewport()->setMouseTracking(true);
-    setBaseTextDocument(new Internal::VcsBaseTextDocument);
     setMimeType(QLatin1String(d->m_parameters->mimeType));
 }
 
@@ -696,21 +695,12 @@ VcsBaseEditorWidget::~VcsBaseEditorWidget()
 
 void VcsBaseEditorWidget::setForceReadOnly(bool b)
 {
-    Internal::VcsBaseTextDocument *vbd = qobject_cast<Internal::VcsBaseTextDocument*>(baseTextDocument());
     VcsBaseEditor *eda = qobject_cast<VcsBaseEditor *>(editor());
-    QTC_ASSERT(vbd != 0 && eda != 0, return);
+    QTC_ASSERT(eda != 0, return);
     setReadOnly(b);
-    vbd->setForceReadOnly(b);
     eda->setTemporary(b);
 }
 
-bool VcsBaseEditorWidget::isForceReadOnly() const
-{
-    const Internal::VcsBaseTextDocument *vbd = qobject_cast<const Internal::VcsBaseTextDocument*>(baseTextDocument());
-    QTC_ASSERT(vbd, return false);
-    return vbd->isForceReadOnly();
-}
-
 QString VcsBaseEditorWidget::source() const
 {
     return d->m_source;
diff --git a/src/plugins/vcsbase/vcsbaseeditor.h b/src/plugins/vcsbase/vcsbaseeditor.h
index 5148f95fd4f5979dd7388e4678f6ef3e65987fe7..b945b790fb1b36a16aa2f954063cb486459fc68a 100644
--- a/src/plugins/vcsbase/vcsbaseeditor.h
+++ b/src/plugins/vcsbase/vcsbaseeditor.h
@@ -113,7 +113,6 @@ public:
      * by default since it should not  trigger when patches are opened as
      * files. */
     void setForceReadOnly(bool b);
-    bool isForceReadOnly() const;
 
     QString source() const;
     void setSource(const  QString &source);
diff --git a/src/plugins/vcsbase/vcsbasetextdocument.cpp b/src/plugins/vcsbase/vcsbasetextdocument.cpp
deleted file mode 100644
index 59de134884848195338278bbd0b4af4ececaed07..0000000000000000000000000000000000000000
--- a/src/plugins/vcsbase/vcsbasetextdocument.cpp
+++ /dev/null
@@ -1,64 +0,0 @@
-/**************************************************************************
-**
-** This file is part of Qt Creator
-**
-** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
-**
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-**
-** GNU Lesser General Public License Usage
-**
-** This file may be used under the terms of the GNU Lesser General Public
-** License version 2.1 as published by the Free Software Foundation and
-** appearing in the file LICENSE.LGPL included in the packaging of this file.
-** Please review the following information to ensure the GNU Lesser General
-** Public License version 2.1 requirements will be met:
-** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** Other Usage
-**
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-** If you have questions regarding the use of this file, please contact
-** Nokia at qt-info@nokia.com.
-**
-**************************************************************************/
-
-#include "vcsbasetextdocument.h"
-
-using namespace VcsBase::Internal;
-
-VcsBaseTextDocument::VcsBaseTextDocument() :
-    m_forceReadOnly(false)
-{
-}
-
-bool VcsBaseTextDocument::isReadOnly() const
-{
-    return m_forceReadOnly ?
-            true :
-            TextEditor::BaseTextDocument::isReadOnly();
-}
-
-bool VcsBaseTextDocument::isModified() const
-{
-    return m_forceReadOnly ?
-            false :
-            TextEditor::BaseTextDocument::isModified();
-}
-
-void VcsBaseTextDocument::setForceReadOnly(bool b)
-{
-    m_forceReadOnly = b;
-}
-
-bool VcsBaseTextDocument::isForceReadOnly() const
-{
-    return m_forceReadOnly;
-}
diff --git a/src/plugins/vcsbase/vcsbasetextdocument.h b/src/plugins/vcsbase/vcsbasetextdocument.h
deleted file mode 100644
index 7b27fb052d60b2a220e3f31053ec6b491f2e8dd3..0000000000000000000000000000000000000000
--- a/src/plugins/vcsbase/vcsbasetextdocument.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/**************************************************************************
-**
-** This file is part of Qt Creator
-**
-** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
-**
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-**
-** GNU Lesser General Public License Usage
-**
-** This file may be used under the terms of the GNU Lesser General Public
-** License version 2.1 as published by the Free Software Foundation and
-** appearing in the file LICENSE.LGPL included in the packaging of this file.
-** Please review the following information to ensure the GNU Lesser General
-** Public License version 2.1 requirements will be met:
-** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain additional
-** rights. These rights are described in the Nokia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** Other Usage
-**
-** Alternatively, this file may be used in accordance with the terms and
-** conditions contained in a signed written agreement between you and Nokia.
-**
-** If you have questions regarding the use of this file, please contact
-** Nokia at qt-info@nokia.com.
-**
-**************************************************************************/
-
-#ifndef VCSBASETEXTDOCUMENT_H
-#define VCSBASETEXTDOCUMENT_H
-
-#include <texteditor/basetextdocument.h>
-
-namespace VcsBase {
-namespace Internal {
-
-// A read-only text document.
-class VcsBaseTextDocument : public TextEditor::BaseTextDocument
-{
-    Q_OBJECT
-
-public:
-    VcsBaseTextDocument();
-
-    bool isReadOnly() const;
-    bool isModified() const;
-
-    void setForceReadOnly(bool b);
-    bool isForceReadOnly() const;
-
-private:
-    bool m_forceReadOnly;
-};
-
-} // namespace Internal
-} // namespace VcsBase
-
-#endif // VCSBASETEXTDOCUMENT_H