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Workaround Qtbug where QAbstractScrollArea::mouseMoveEvent(...) is called falsely when quickly double tapping on a touchpad of a notebook running Windows

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This commit is contained in:
Eugene Chornyi 2020-07-09 09:36:12 +02:00
parent e6b2c7c4ce
commit 06969f9dd4
1 changed files with 16 additions and 0 deletions
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16
src/frontends/qt/GuiWorkArea.cpp
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@ -852,6 +852,9 @@ void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(), FuncRequest const cmd(LFUN_MOUSE_RELEASE, e->x(), e->y(),
q_button_state(e->button()), q_key_state(e->modifiers())); q_button_state(e->button()), q_key_state(e->modifiers()));
#if (QT_VERSION > QT_VERSION_CHECK(5,10,1))
d->synthetic_mouse_event_.cmd = cmd; // QtBug QAbstractScrollArea::mouseMoveEvent
#endif
d->dispatch(cmd); d->dispatch(cmd);
e->accept(); e->accept();
} }
@ -859,6 +862,19 @@ void GuiWorkArea::mouseReleaseEvent(QMouseEvent * e)
void GuiWorkArea::mouseMoveEvent(QMouseEvent * e) void GuiWorkArea::mouseMoveEvent(QMouseEvent * e)
{ {
#if (QT_VERSION > QT_VERSION_CHECK(5,10,1))
// cancel the event if the coordinates didn't change, this is due to QtBug
// QAbstractScrollArea::mouseMoveEvent, the event is triggered falsely when quickly
// double tapping a touchpad. To test: try to select a word by quickly double tapping
// on a touchpad while hovering the cursor over that word in the work area.
// This bug does not occur on Qt versions 5.10.1 and below. Only Windows seems to be affected.
// ML thread: https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg211699.html
// Qt bugtracker: https://bugreports.qt.io/browse/QTBUG-85431
if (e->x() == d->synthetic_mouse_event_.cmd.x() && // QtBug QAbstractScrollArea::mouseMoveEvent
e->y() == d->synthetic_mouse_event_.cmd.y()) // QtBug QAbstractScrollArea::mouseMoveEvent
return; // QtBug QAbstractScrollArea::mouseMoveEvent
#endif
// we kill the triple click if we move // we kill the triple click if we move
doubleClickTimeout(); doubleClickTimeout();
FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(), FuncRequest cmd(LFUN_MOUSE_MOTION, e->x(), e->y(),