Added warning to fullscreen mode for Linux as this doesn't currently …

…work. Left in a number of commented approached I already tried. This is worth revisiting when Linux uses a modern post-ICCCM specification windows manager

src/mainwindow.cpp

@@ -3876,12 +3876,21 @@ void MainWindow::updateScreenRatio()
  */
 void MainWindow::on_actionFull_Screen_triggered()
 {
+
+#ifdef __linux__
+    QMessageBox::warning(this, "Apologies", "Full screen doesn't currently work on Linux due to limitations of the QWidget::showFullScreen() call. Sorry about that.");
+    return;
+    //fullScreenDialog->setWindowFlags( Qt::X11BypassWindowManagerHint);
+    // fullScreenDialog->setWindowFlags(Qt::X11BypassWindowManagerHint | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);
+    //fullScreenDialog->showMaximized();
+    //fullScreenDialog->setWindowState(Qt::WindowFullScreen);
+    //fullScreenDialog->show();
+#else
     if (isGLFullScreen == false)
     {
         fullScreenDialog = new FullScreenWindow(this, gl3widget);
-        fullScreenDialog->showFullScreen();
-        //fullScreenDialog->show();
 
+        fullScreenDialog->showFullScreen();
         isGLFullScreen = true;
 
         //qDebug() << "[Full Screen Mode] Opening full screen mode";
@@ -3896,4 +3905,5 @@ void MainWindow::on_actionFull_Screen_triggered()
 
         //qDebug() << "[Full Screen Mode] Closing full screen mode";
     }
+#endif
 }