Merge remote-tracking branch 'origin/4.12'

Conflicts:
	src/plugins/android/androidmanifesteditorwidget.cpp

Change-Id: I8143d9e02837dcd78a637da7b333a6eeebb105cb

src/plugins/debugger/debuggermainwindow.cpp

@@ -302,6 +302,11 @@ DebuggerMainWindow::DebuggerMainWindow()
     cmd->setAttribute(Command::CA_Hide);
     viewsMenu->addAction(cmd, Core::Constants::G_DEFAULT_THREE);
 
+    // HACK: See QTCREATORBUG-23755. This ensures the showCentralWidget()
+    // call in restorePersistentSettings() below has something to operate on,
+    // and a plain QWidget is what we'll use anyway as central widget.
+    setCentralWidget(new QWidget);
+
     restorePersistentSettings();
 }