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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 6.3.0 Beta1, 6.4.0 Beta1
Affects Version/s: 6.2.3
Component/s: GUI: Basic Input System (keyboard, mouse, touch)
Labels:
None
Environment:
OpenSUSE Leap 15.3, GCC 10.3.0

Platform/s:

Linux/X11
Commits:
0a64a044b6 (qt/qtbase/dev) 0a64a044b6 (qt/tqtc-qtbase/dev) a28fd4e54d (qt/qtbase/6.3) a28fd4e54d (qt/tqtc-qtbase/6.3)

Description

QHelpEvent::globalPos() returns frequently the wrong value QPointF(-1,-1). This causes tooltips to appear near the top/left edge of the screen.

The reason is the call of 'dispatchEnterLeave' in QApplicationPrivate::sendMouseEvent. Before the call, the result of 'event->globalPosition()' is correct. After the call QPointF(-1,-1) is returned.

To reproduce the bug, add the lines marked with '#if 1' to 'sendMouseEvent' and move the mouse e.g. over the toolbar of Qt Designer.

    } else if (lastMouseReceiver && widgetUnderMouse) {
        #if 1
        auto savedPosition = event->globalPosition();
        #endif

        // Dispatch enter/leave if we move:
        // 1) from an alien widget to another alien widget or
        //    from a native widget to an alien widget (first OR case)
        // 2) from an alien widget to a native widget (second OR case)
        if ((alienWidget && alienWidget != lastMouseReceiver)
            || (isAlien(lastMouseReceiver) && !alienWidget)) {
            if (activePopupWidget) {
                if (!QWidget::mouseGrabber())
                    dispatchEnterLeave(alienWidget ? alienWidget : nativeWidget, lastMouseReceiver, event->globalPosition());
            } else {
                dispatchEnterLeave(receiver, lastMouseReceiver, event->globalPosition());
            }

        #if 1
        if (event->globalPosition() != savedPosition)
            qDebug() << event->globalPosition() << savedPosition;
        #endif
        }
    }