Bug 468155

Summary:	Scrollbar handle changes size based on the currently visible messages
Product:	[Applications] NeoChat	Reporter:	Jack Hill <jackhill3103>
Component:	General	Assignee:	Tobias Fella <fella>
Status:	RESOLVED FIXED
Severity:	minor	CC:	carl, james.h.graham, josh, justin.zobel
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Video

Description Jack Hill 2023-04-04 20:25:12 UTC

SUMMARY
When scrolling through a list of messages, the scrollbar will change size even when no messages are loaded. It seems to be based on the size of the currently shown messages (not sure how exactly; haven't looked at the code).

STEPS TO REPRODUCE
1. Send some messages of varying sizes
2. Scroll through the messages

OBSERVED RESULT
See how the scrollbar goes small when you enter a large message, and large again when you leave the large message

EXPECTED RESULT
Scrollbar size should be based on the total height of all fetched messages (i.e. it should only change size if more messages are loaded)

SOFTWARE/OS VERSIONS
NeoChat version: git master @ commit 2470990d7558a54d952ea5cb4ae3f8a9ccfba780
Operating System: openSUSE Tumbleweed 20230327
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.8-1-default (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION

Comment 1 James Graham 2023-04-08 14:17:38 UTC

This is this issue https://invent.kde.org/network/neochat/-/issues/96 in action. It's caused by the delegates dynamically loading in as you scroll. The QML listView doesn't know the true size of the item until fully loaded so as item are loaded/unloaded as you scroll this causes the scroll bar handle to expand/contract based upon the current total size of items loaded.

Comment 2 Justin Zobel 2023-08-16 04:00:23 UTC

Created attachment 160995 [details]
Video

Attached is another video showing the issue though in a much more aggressive manner.

Comment 3 Joshua Goins 2024-11-16 03:34:36 UTC

Closing this as we don't use an interactive scrollbar anymore