Bug 381381

Summary: window flicker during initial page load and when moving mouse over active elements
Product: [Applications] konqueror Reporter: RJVB <rjvbertin>
Component: webenginepartAssignee: Konqueror Developers <konq-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal    
Priority: NOR    
Version: 5.0.97   
Target Milestone: ---   
Platform: Compiled Sources   
OS: macOS   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description RJVB 2017-06-18 20:32:52 UTC 
Konqueror shows very fast whole-window flicker when loading a page as well as when moving the mouse over "active elements" (presumably links, possibly other elements too).
I first noticed this in 17.04.2 but it is also present in 16.12.0. It may be a regression in QtWebEngine 5.8.0 but I do NOT observe the same glitch in Qupzilla using the same Qt install. The issue also disappears when switching to the KHtml engine. The issue also disappears when I use the XCB QPA (still on Mac).

Any chance it could be related to these terminal warnings?
```
QWidget::paintEngine: Should no longer be called
QPainter::begin: Paint device returned engine == 0, type: 1
QPainter::translate: Painter not active
QPainter::setClipRect: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
QPainter::fillPath: Painter not active
QPainter::restore: Unbalanced save/restore
QPainter::hasClipping: Painter not active
QPainter::setPen: Painter not active
QPainter::setBrush: Painter not active
QPainter::drawRects: Painter not active
QPainter::save: Painter not active
QPainter::setRenderHint: Painter must be active to set rendering hints
(etc)
```
Comment 1 Justin Zobel 2022-11-06 09:25:23 UTC 
Thank you for reporting this issue in KDE software. As it has been a while since this issue was reported, can we please ask you to see if you can reproduce the issue with a recent software version?

If you can reproduce the issue, please change the status to "REPORTED" when replying. Thank you!
Comment 2 Bug Janitor Service 2022-11-21 05:13:48 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 3 Bug Janitor Service 2022-12-06 05:20:30 UTC 
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!