427431 - Use gdk_window_move_region to scroll partial rects on GTK2

Status: RESOLVED INVALID

(Core :: Widget: Gtk, defect)

Description

[Robert O'Callahan (:roc) (email my personal email if necessary)]

We can use gdk_window_move_region to scroll partial rects on GTK2 to speed up fixed-pos painting the same way we do on Windows. See discussion in bug 382392.

Comment 1

[Cory Dodt]

See also bug 201307 which appears to be the problem this is intended to address.

Comment 2

[Bernhard Redl]

is this bug the main origin of the extrem slow scrolling issue?
as mentioned in 
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/217580

this is an example website
http://stinkt.kicks-ass.org/1b6cc1af2e8437646c9b7422d78e6eb3/slidecast%20-%20studio%20-%20vertical-view.html

Comment 3

[Bernhard Redl]

I removed all the position:fixed values in the css file and the scrolling on the resulting page is very fast.

http://stinkt.kicks-ass.org/1b6cc1af2e8437646c9b7422d78e6eb3/no_css_fix_pos.html

Comment 4

[Jonathan Watt [:jwatt]]

Closing GTK2 related bugs since we removed GTK2 support at the beginning of 2018 in bug 1278282. Probably best to open a new bug in the unlikely event that any of these are still relevant.