Restore support for -title command line argument on X11, add -qwindowtitle.

-title disappeared between Qt4 and Qt5, due to all the refactorings around QPA.
Making the caption of the mainwindow configurable allows custom setups
for specific users or use cases.

[ChangeLog][QtGui][QGuiApplication] Restore support for -title command line
argument on X11, add -qwindowtitle on all platforms.

Change-Id: I73e6bf21248f3419178eba583b257172a175e74e
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Albert Astals Cid <albert.astals@canonical.com>
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp b/tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp
index d4237b135f..6ef9957fa1 100644
--- a/tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp
+++ b/tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp
@@ -60,6 +60,7 @@ class tst_QGuiApplication: public tst_QCoreApplication
 
 private slots:
     void displayName();
+    void firstWindowTitle();
     void focusObject();
     void allWindows();
     void topLevelWindows();
@@ -83,6 +84,17 @@ void tst_QGuiApplication::displayName()
     QCOMPARE(QGuiApplication::applicationDisplayName(), QString::fromLatin1("The GUI Application"));
 }
 
+void tst_QGuiApplication::firstWindowTitle()
+{
+    int argc = 3;
+    char *argv[] = { const_cast<char*>("tst_qguiapplication"), const_cast<char*>("-qwindowtitle"), const_cast<char*>("User Title") };
+    QGuiApplication app(argc, argv);
+    QWindow window;
+    window.setTitle("Application Title");
+    window.show();
+    QCOMPARE(window.title(), QString("User Title"));
+}
+
 class DummyWindow : public QWindow
 {
 public: