Bug 310662

Summary:	Dolphin scroll lagging when hidden folders symlinks are visible
Product:	[Applications] dolphin	Reporter:	Frank Souza <franksouza183>
Component:	view-engine: icons mode	Assignee:	Dolphin Bug Assignee <dolphin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	NOR
Version:	2.1
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
URL:	http://www.youtube.com/watch?v=N4v4CZEWGNA&feature=youtu.be
Latest Commit:	http://commits.kde.org/kde-baseapps/381b17964d49259955eb5c5e537d290b26c162ef	Version Fixed In:	4.11.1
Sentry Crash Report:

Description Frank Souza 2012-11-25 17:38:29 UTC

Dolphin scroll lagging when hidden folders symlinks are in a visible area. The attached video explains everything. The bug does not appear to be related to the theme icon. I also tested with Okygen and several other.

https://dl.dropbox.com/u/17190485/dolphin-scroll-lagging.webm

Reproducible: Always

Actual Results:  
Scroll lagging

Expected Results:  
No lag when scroll

Comment 1 Frank Souza 2012-11-25 18:31:56 UTC

Youtube video link >> http://www.youtube.com/watch?v=N4v4CZEWGNA&feature=youtu.be

Comment 2 Frank Reininghaus 2012-11-27 06:12:46 UTC

Thanks for the bug report! I can confirm the problem.

Comment 3 Frank Reininghaus 2013-08-14 21:49:10 UTC

Git commit 381b17964d49259955eb5c5e537d290b26c162ef by Frank Reininghaus.
Committed on 14/08/2013 at 21:44.
Pushed by freininghaus into branch 'KDE/4.11'.

Fix slow scrolling when hidden files or symbolic links are shown

The problem was that we drawed the overlays using KIconLoader, which can
be very slow, every time an item appeared on the screen. This commit
makes sure that not only the icon, but the icon including overlays is
cached in QPixmapCache. Therefore, the overlay drawing is done just once
for each icon+overlays combination.

For previews, the overlay drawing is done in KFileItemModelRolesUpdater
just after the preview is received.
Related: bug 314339
FIXED-IN: 4.11.1
REVIEW: 111956

M  +16   -0    dolphin/src/kitemviews/kfileitemmodelrolesupdater.cpp
M  +18   -19   dolphin/src/kitemviews/kstandarditemlistwidget.cpp
M  +1    -1    dolphin/src/kitemviews/kstandarditemlistwidget.h

http://commits.kde.org/kde-baseapps/381b17964d49259955eb5c5e537d290b26c162ef