https://bugs.kde.org/show_bug.cgi?id=429502
Bug ID: 429502
Summary: Significant delay/lag when hovering over grouped tasks
button
Product: plasmashell
Version: 5.20.3
Platform: unspecified
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Task Manager and Icons-Only Task Manager
Assignee: h...@kde.org
Reporter: bugs-...@quitesimple.org
CC: plasma-b...@kde.org
Target Milestone: 1.0
SUMMARY
Hovering over a grouped task icon slows down the tasks plasmoid temporarily
STEPS TO REPRODUCE
Let's assume the following configuration on the icon-only task manager.
However, the issue also occurs in the normal task manager:
Appearance -> Show tooltips: false
Appearance -> Highlight windows when hovering over tasks: false
Appearance -> Mark applications that play audio: false
Max rows: 2
Behavior -> Group: by program name
Behavior -> Show only tasks -> From current activity: true
Now comes the issue. Bear in my mind however, it's a bit difficult to describe:
Let's say I start several different programs, each of those get their icon in
the task list. Let's say I then start 15 konsole windows. Therefore, those
konsole windows will be grouped.
If I click on the konsole icons, I experience a lag before the group popup menu
shows. When I start hovering over the items, I at first also experience a delay
before the first entry gets highlighted. After that however, there is no lag.
All other elements will be highlighted (i. e. the background of the icon
changes...). If howver I close the group popup and then I open it again, I
experience the same issue.
In fact, I get the delay before I even click the grouped icon. Just hovering
over the konsole group icon will cause a delay, and if I move my mouse to other
icons, there will be a delay before they get highlighted. So, hovering over a
grouped task seems to be triggering something that slows the plasmoid.
In short, the more grouped windows, the more delay when I hover over the icon.
With just a few, this isn't noticable.
I hope it's clear enough to understand what I mean. I could maybe also create a
short video if necessary.
POSSIBLE SOLUTION
Anyway, I tried to get to the bottom of this and I believe I found something in
/usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml.
If inside PlasmaCore.ToolTipArea, in onContainsMouseChanged, I simply insert a
return at the beginning (so it does nothing), the issue is gone.
In fact, the line "toolTipDelegate.rootIndex =
tasksModel.makeModelIndex(itemIndex, -1);" appears to be the actual problem. If
I comment it out, I don't experience this issue. I now have more than 60
instances of konsole open and experience none of the delays mentioned above.
Keep in mind, that as mentioned I have tooltips disabled, so I am not sure
whether ToolTipArea should even be involved here. Nevertheless, seems the
actual delay is caused by tasksModel.makeModelIndex().
SOFTWARE/OS VERSIONS
I created a new user profile with a fresh config in kubuntu 20.10, and also
briefly reproduced it in a voidlinux with Plasma 5.20.3.
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