https://bugs.kde.org/show_bug.cgi?id=439003
Bug ID: 439003
Summary: Clearing Run output view filter can be extremely slow
if the view contains many lines
Product: kdevelop
Version: git master
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Output Views
Assignee: kdevelop-bugs-n...@kde.org
Reporter: igor...@gmail.com
Target Milestone: ---
Created attachment 139580
--> https://bugs.kde.org/attachment.cgi?id=139580&action=edit
Reproducing example
SUMMARY
Because of a Qt performance bug, clearing the Run output view filter has O(N^2)
complexity when there are N lines. The bug has been fixed in Qt 6.x by
https://codereview.qt-project.org/c/qt/qtbase/+/341365. However the fix has not
been cherry-picked to KDE's Qt5PatchCollection yet.
STEPS TO REPRODUCE
1. Execute the attached reproducing example in KDevelop
2. Enter the number equal to line_count/2 into the Run output view filter
(250000 by default).
3. Click the clear button at the right end of the output view filter.
OBSERVED RESULT
Clearing the filter that matches the single middle line takes about 14 seconds
on my system.
EXPECTED RESULT
Clearing the filter is instantaneous. This is indeed the case when a patched Qt
version is installed.
SOFTWARE/OS VERSIONS
Manjaro GNU/Linux, Xfce
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2+kde+r196
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