https://bugs.kde.org/show_bug.cgi?id=462399
Bug ID: 462399
Summary: [CRASH/LOCKUP] ScrollView in notification applet
causes freeze depending on size
Classification: Plasma
Product: plasmashell
Version: master
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Notifications
Assignee: plasma-b...@kde.org
Reporter: xna...@hydra-development.net
CC: k...@privat.broulik.de
Target Milestone: 1.0
Created attachment 154140
--> https://bugs.kde.org/attachment.cgi?id=154140&action=edit
demo of the bug
SUMMARY
Since the ScrollBar component does not occupy any physical space when hidden,
notifications occupy a little more space. Conversely, when the ScrollBar is
visible, notifications get shrunk down by a bit.
Although this is intended behavior, this causes the component to enter an
infinite loop whenever the notification applet is at a certain size where
notifications without a ScrollBar occupy enough space to warrant a ScrollBar,
but once the ScrollBar is present, shrink down to a size to where it's no
longer needed.
We then rapidly go back and forth between big(ger) notifs and no ScrollBar (but
overflow) and smal(ler) notifs and a ScrollBar (but no overflow), causing the
entire plasmashell to lock up.
STEPS TO REPRODUCE
0. Clear your notification history
1. Take two screenshots with spectacle
2. Open the notification applet twice (so that the "show more" button is
visible)
3. Open the notification history
4. Slowly increase its vertical size
OBSERVED RESULT
Plasmashell locks up and becomes entirely unresponsive
EXPECTED RESULT
Plasmashell does NOT lock up
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