Fixed partial screenshot in desktop mode

Note: the screenshot can only be taken on the primary display now
(rather than on the display in which the mouse is, as was the case
before).

src/desktop/UBCustomCaptureWindow.cpp

@@ -74,8 +74,7 @@ int UBCustomCaptureWindow::execute(const QPixmap &pScreenPixmap)
     QDesktopWidget *desktop = QApplication::desktop();
     int currentScreen = desktop->screenNumber(QCursor::pos());
     setGeometry(desktop->screenGeometry(currentScreen));
-
-    UBPlatformUtils::showFullScreen(this);
+    this->show();
     setWindowOpacity(1.0);
 
     return exec();

src/desktop/UBDesktopAnnotationController.cpp

@@ -501,12 +501,10 @@ QPixmap UBDesktopAnnotationController::getScreenPixmap()
 {
     QDesktopWidget *desktop = QApplication::desktop();
 
-    // we capture the screen in which the mouse is.
-    const QRect primaryScreenRect = desktop->screenGeometry(QCursor::pos());
-    QCoreApplication::flush();
 
-    return QPixmap::grabWindow(desktop->winId(), primaryScreenRect.x()
-                               , primaryScreenRect.y(), primaryScreenRect.width(), primaryScreenRect.height());
+    QScreen * screen = QApplication::primaryScreen();
+    return screen->grabWindow(desktop->effectiveWinId());
+
 }