QmlApplicationViewer: properly resolve install paths

This change makes QmlApplicationViewer applications find their qml
resources also in non-installed builds, regardless of the current
working directory.

On non-unix platforms applicationDirPath() is not used at all, and on
unix, it's used only for searching applicationDirPath/../path, which
is valid only after install. In-source or shadow-built apps find
their qml resources only if working directory == application
(executable) directory.

Path may refer to subdirectory in application directory. On windows,
non-installed application binary can also reside in /Release or
/Debug, so its resources need to be searched under parent directory
as well.

Change-Id: I81f602406787c20830c656fd5dffd11aa9b4afba
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

share/qtcreator/templates/qtquickapp/qmlapplicationviewer/qmlapplicationviewer.cpp

@@ -56,7 +56,6 @@ class QmlApplicationViewerPrivate
 
 QString QmlApplicationViewerPrivate::adjustPath(const QString &path)
 {
-#ifdef Q_OS_UNIX
 #ifdef Q_OS_MAC
     if (!QDir::isAbsolutePath(path))
         return QString::fromLatin1("%1/../Resources/%2")
@@ -65,11 +64,14 @@ QString QmlApplicationViewerPrivate::adjustPath(const QString &path)
     if (!QDir::isAbsolutePath(path))
         return QString::fromLatin1("app/native/%1").arg(path);
 #elif !defined(Q_OS_ANDROID)
-    const QString pathInInstallDir =
+    QString pathInInstallDir =
             QString::fromLatin1("%1/../%2").arg(QCoreApplication::applicationDirPath(), path);
     if (QFileInfo(pathInInstallDir).exists())
         return pathInInstallDir;
-#endif
+    pathInInstallDir =
+            QString::fromLatin1("%1/%2").arg(QCoreApplication::applicationDirPath(), path);
+    if (QFileInfo(pathInInstallDir).exists())
+        return pathInInstallDir;
 #endif
     return path;
 }