Bug 478518

Summary:	Tries and fails to generate window thumbnails for launchers of non-running apps
Product:	[Plasma] plasmashell	Reporter:	Nate Graham <nate>
Component:	Task Manager and Icons-Only Task Manager widgets	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	minor	CC:	psychicsurgeon, qydwhotmail
Priority:	NOR	Keywords:	qt6
Version First Reported In:	master
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:	https://invent.kde.org/plasma/plasma-desktop/-/commit/30523aa003d1cb543368b01d818db38c4e7c82ec	Version Fixed/Implemented In:	6.0
Sentry Crash Report:

Description Nate Graham 2023-12-14 17:56:44 UTC

Plasma 6 Wayland, today's git master.


STEPS TO REPRODUCE
1. Have an Icons-Only Task Manager on your panel with multiple pinned launchers and no open apps
2. Rapidly move the cursor across the launcher icons


OBSERVED RESULT
journal log is filled with:

Dec 14 10:54:03 Liberator plasmashell[2272]: error creating screencast "Could not find window id 0"
Dec 14 10:54:03 Liberator plasmashell[2272]: error creating screencast "Could not find window id 0"
Dec 14 10:54:03 Liberator plasmashell[2272]: error creating screencast "Could not find window id 0"
Dec 14 10:54:03 Liberator plasmashell[2272]: error creating screencast "Could not find window id 0"


EXPECTED RESULT
No screencast is attempted to be created because the app isn't running, so clearly it has no windows to generate a screencast for

Comment 1 Bug Janitor Service 2023-12-14 18:20:01 UTC

A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/1930

Comment 2 Nate Graham 2023-12-15 15:18:20 UTC

Git commit 30523aa003d1cb543368b01d818db38c4e7c82ec by Nate Graham.
Committed on 15/12/2023 at 16:09.
Pushed by ngraham into branch 'master'.

applets/taskmanager: Don't load PipeWire stuff for launchers

If task is a launcher, we know it doesn't have any windows, which means
there's nothing to screencast and we can bail out early.
FIXED-IN: 6.0

M  +3    -2    applets/taskmanager/package/contents/ui/ToolTipInstance.qml

https://invent.kde.org/plasma/plasma-desktop/-/commit/30523aa003d1cb543368b01d818db38c4e7c82ec

Comment 3 David 2024-01-01 19:04:22 UTC Comment hidden (spam)

I actually see this, but what happens is that my task disappears from my task bar. I'm NOT using the icons only one, but the full one. The only relevant thing in the logs is this error message

Comment 4 Nate Graham 2024-01-10 19:33:30 UTC Comment hidden (spam)

That sounds like a different issue; can you submit a new bug report for it? Thanks.