Bug 203888

Summary:	Task manager is slow updating the windows list as changing the desktop
Product:	[Plasma] plasma4	Reporter:	luisfe <luisfe>
Component:	widget-taskbar	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED FIXED
Severity:	normal	CC:	g111, kde
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Debian testing
OS:	Unspecified
Latest Commit:		Version Fixed In:
Attachments:	part of the panel when switching the desktop

Description luisfe 2009-08-14 22:37:21 UTC

Version:            (using KDE 4.3.0)
Installed from:    Debian testing/unstable Packages

I usually work with five desktops. The task manager is configured to show only the windows in the current desktop.

If I change the desktop, then the task manager takes an appreciable time to update the list of windows in the current desktop. It can take up to four seconds to show the new situation.

It happens with and without desktop effects. Changing the window with focus within the same desktop , or open a new bunch of windows is reflected instantaniously. The problem only appears as changing the desktop.

Comment 1 g111 2009-11-22 16:21:47 UTC

I second this. But I am not sure with the 4-5 seconds, it may be 2 seconds only. But if having 40 or more windows open on one desktop it takes some time for the task manager to finish drawing.

IMHO the problem is that there is only one task manager that has to be redrawn on each desktop switch. It would be better to have one task manager for each desktop that keeps its state.

In KDE4.4 there comes another problem: On changes of the windows (opening or closing a window) the entries in the task manager slide to their new position. This usually looks nice and also may be good for better orientation. But in case of an desktop switch this effect should be turned off. Otherwise the task manager does look very hectically/fluttering(?) on desktop switches.

Comment 2 Nicolas L. 2010-06-07 10:34:41 UTC

Do you reproduce with kde 4.4.4 or 4.5 beta ?

Comment 3 g111 2010-06-07 22:45:36 UTC

Currently I cannot see a longer taking redrawing in KDE4.4.4 (debian/sid). The drawing of the panel is very fast, tested with XRender and without composite.

But there is one flickering left. When switching the desktop all buttons seem to be condensed in the upper left corner of the task manager in only one button. This button is of half the size of the task manager. From there the buttons are placed to the right position (but without a moving animation). I did try to take a screencast. You cannot see the animation on it, but the single pictures show what I mean, I think.

Comment 4 g111 2010-06-07 22:46:30 UTC

Created attachment 47793 [details]
part of the panel when switching the desktop

Comment 5 luisfe 2010-06-08 12:39:51 UTC

I can confirm that this does not happen anymore with kde 4.4.3

About the problem specifies in #3. I think that it may well be an animation that is too fast. In any case, it is a different problem. So I close this bug.