126380 - Dragging slow/blocking because of superfluous decoration

Status: RESOLVED DUPLICATE of bug 86138

(SeaMonkey :: General, defect)

Description

[Florian Weimer]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.7) Gecko/20020112
BuildID:    0.9.7 Debian (20020112)

Dragging shows superfluous decoration (a trail of paper sheets) which blocks
Mozilla for quite some time until it disappears.

Reproducible: Always
Steps to Reproduce:
Use Mozilla remotely over a rather slow link with considerable latency (an SSH
tunnel over a 1 MBit link, for example).

Drag some item using the mouse.

Actual Results:  The sheet trail appears instantly, but disappers very slowly. 
Mozilla does not accept mouse clicks until the sheet trail has disappeared.

Expected Results:  No sheet trail should appear. Mozilla should remain responsive.

It seems as if Mozilla draws a new sheet of paper for each mouse position event
it receives. Mouse position events are small an can be transmitted quickly, but
the sheet draw instructions consume considerable bandwidth.

Comment 1

[Adrian Ulrich]

just my 5 (euro-)cents: isn't that a GTK problem?

Comment 2

[Florian Weimer]

Maybe. But Mozilla could turn of the sheet trail nevertheless, I think.

Comment 3

[Boris Zbarsky [:bzbarsky]]

The sheet trail is just there because of latency.  Mozilla attempts to draw only
one sheet, at the mouse location.

to blizzard, who's worked on this stuff before.

Comment 4

[Christopher Blizzard (:blizzard)]

Dup.

*** This bug has been marked as a duplicate of 86138 ***