Details
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Bug
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Resolution: Done
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P2: Important
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5.10
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None
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ab7d48625aed1c1bb56148f57f958371e810cf4c
Description
Reproducible in assistant, when calling setSource() with an url containing the proper anchor. Sometimes it works properly, but sometimes after setting the vbar to the proper value, an additional call to vbar->setValue() comes from Qt. The call stack for the unwanted one:
1 QAbstractSlider::setValue qabstractslider.cpp 549 0x7ffff79e061b 2 QTextEditPrivate::_q_ensureVisible qtextedit.cpp 342 0x7ffff79aa63f 3 QTextEdit::qt_static_metacall moc_qtextedit.cpp 361 0x7ffff79addf1 4 QMetaObject::activate qobject.cpp 3766 0x7ffff6d1c013 5 QMetaObject::activate qobject.cpp 3628 0x7ffff6d1c39d 6 QWidgetTextControl::visibilityRequest moc_qwidgettextcontrol_p.cpp 566 0x7ffff7a538ed 7 QWidgetTextControl::ensureCursorVisible qwidgettextcontrol.cpp 3156 0x7ffff7a55bb0 8 QTextEdit::ensureCursorVisible qtextedit.cpp 2641 0x7ffff79abe67 9 QTextEdit::inputMethodEvent qtextedit.cpp 1707 0x7ffff79abeed 10 QWidget::event qwidget.cpp 8870 0x7ffff7887ab8 11 QFrame::event qframe.cpp 550 0x7ffff794ecdc 12 QAbstractScrollArea::event qabstractscrollarea.cpp 1155 0x7ffff79b8ab8 13 QTextEdit::event qtextedit.cpp 1080 0x7ffff79ac316 14 QTextBrowser::event qtextbrowser.cpp 1269 0x7ffff7a4a025 15 QApplicationPrivate::notify_helper qapplication.cpp 3725 0x7ffff783ea2d 16 QApplication::notify qapplication.cpp 3688 0x7ffff78486b2 17 QCoreApplication::notifyInternal2 qcoreapplication.cpp 1021 0x7ffff6cebd20 18 QCoreApplication::sendEvent qcoreapplication.h 234 0x7ffff7e69ae5 19 QIBusPlatformInputContext::updatePreeditText qibusplatforminputcontext.cpp 289 0x7ffff7e69ae5 20 QIBusPlatformInputContext::qt_static_metacall moc_qibusplatforminputcontext.cpp 113 0x7ffff7e725d8 21 QMetaObject::activate qobject.cpp 3766 0x7ffff6d1c013 22 QMetaObject::activate qobject.cpp 3628 0x7ffff6d1c39d 23 QIBusInputContextProxy::UpdatePreeditText moc_qibusinputcontextproxy.cpp 637 0x7ffff7e7476e 24 QIBusInputContextProxy::qt_static_metacall moc_qibusinputcontextproxy.cpp 239 0x7ffff7e748e8 25 QIBusInputContextProxy::qt_metacall moc_qibusinputcontextproxy.cpp 503 0x7ffff7e762af 26 QDBusConnectionPrivate::deliverCall qdbusintegrator.cpp 998 0x7fffea1c7e4f 27 QDBusCallDeliveryEvent::placeMetaCall qdbusintegrator_p.h 114 0x7fffea1d390d 28 QObject::event qobject.cpp 1246 0x7ffff6d1c7ff 29 QApplicationPrivate::notify_helper qapplication.cpp 3725 0x7ffff783ea2d 30 QApplication::notify qapplication.cpp 3097 0x7ffff78467dc 31 QCoreApplication::notifyInternal2 qcoreapplication.cpp 1021 0x7ffff6cebd20 32 QCoreApplication::sendEvent qcoreapplication.h 234 0x7ffff6cf0fab 33 QCoreApplicationPrivate::sendPostedEvents qcoreapplication.cpp 1696 0x7ffff6cf0fab 34 QCoreApplication::sendPostedEvents qcoreapplication.cpp 1550 0x7ffff6cf1708 35 postEventSourceDispatch qeventdispatcher_glib.cpp 276 0x7ffff6d47662 36 g_main_context_dispatch 0x7ffff2930e52 37 g_main_context_iterate.isra 0x7ffff29311d0 38 g_main_context_iteration 0x7ffff293127c 39 QEventDispatcherGlib::processEvents qeventdispatcher_glib.cpp 423 0x7ffff6d47028 40 QPAEventDispatcherGlib::processEvents qeventdispatcher_glib.cpp 69 0x7fffea516683 41 QEventLoop::processEvents qeventloop.cpp 134 0x7ffff6ce9b2f 42 QEventLoop::exec qeventloop.cpp 212 0x7ffff6ce9f75 43 QCoreApplication::exec qcoreapplication.cpp 1309 0x7ffff6cf3c42 44 main main.cpp 392 0x45962f
The above one sets the vbar value to 8, which means the document is scrolled to the top.
Happens completely randomly. Crazy.
To reproduce:
1. Run assistant
2. Go to index
3. Enter e.g. "number"
4. Double click on it, it will open a Choose Topic dialog
5. Double click one of the proposed topics. In about 50% of cases it will work correctly, and in about the other 50% of cases it will show the right page, but the top of it instead position it on the right anchor.
===========================
Attached also the small example. You may reproduce it there, outside of assistant. It looks like there are some issues with focus in event and input method event. When you scroll the read-only text edit and just after that call setFocus() for it, you may receive the inputMethodEvent, which by default calls ensureCursorVisible() - which scrolls back the view to the position 0 (readonly text edit doesn't modify its position when scrolling the view). In addition, it only happens when some other dialog was shown before. This may be reproduced in the attached example. The issue is that widgets, which have WA_InputMethodEnabled flag shouldn't receive the inputMethod event at all.
Attachments
Issue Links
- relates to
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- Closed
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| For Gerrit Dashboard: QTBUG-63066 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 216976,6 | Fix read-only text browser sometimes jump to the top of the document | 5.11 | qt/qtbase | Status: MERGED | +2 | 0 |