TextEditor: Support contents() and contentsChanged()

Change-Id: Ia1957d489b8bf2b42c69f739913b50e52e488a69
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/texteditor/textdocument.cpp

@@ -237,7 +237,7 @@ TextDocument::TextDocument(Id id)
     });
 
     connect(&d->m_document, &QTextDocument::contentsChanged,
-            this, &TextDocument::contentsChanged);
+            this, &Core::IDocument::contentsChanged);
     connect(&d->m_document, &QTextDocument::contentsChange,
             this, &TextDocument::contentsChangedWithPosition);
 
@@ -551,6 +551,11 @@ bool TextDocument::save(QString *errorString, const QString &saveFileName, bool
     return true;
 }
 
+QByteArray TextDocument::contents() const
+{
+    return plainText().toUtf8();
+}
+
 bool TextDocument::setContents(const QByteArray &contents)
 {
     return setPlainText(QString::fromUtf8(contents));

src/plugins/texteditor/textdocument.h

@@ -104,6 +104,7 @@ public:
 
     // IDocument implementation.
     bool save(QString *errorString, const QString &fileName, bool autoSave) override;
+    QByteArray contents() const override;
     bool setContents(const QByteArray &contents) override;
     bool shouldAutoSave() const override;
     bool isFileReadOnly() const override;
@@ -142,7 +143,6 @@ public:
 signals:
     void aboutToOpen(const QString &fileName, const QString &realFileName);
     void openFinishedSuccessfully();
-    void contentsChanged();
     void contentsChangedWithPosition(int position, int charsRemoved, int charsAdded);
     void tabSettingsChanged();
     void fontSettingsChanged();