Public bug reported:
Repro steps:
1. Connect a mouse whose button press/release events arrive slowly.
2. Open any gtk app. (For example, gedit or gcalctool.)
3. Right-click somewhere to open a context menu whose first item is selectable.
(For example, in gedit just type something and then right-click on the text
area--the first item will be Undo and will be selectable. In gcalctool, type in
a number, highlight it, and then right-click on the number--the first item will
be Cut and will be selectable.)
What I expect to happen:
A context menu should appear and wait for the user to make a selection.
What happens instead:
A context menu appears and disappears and the app immediately executes the
first entry without any further clicks. The user doesn't even have enough time
to see what has happened. Obviously this is disorientating and annoying.
This is a regression--it used to work fine. I think it started after the update
to Maverick.
I believe the problem only occurs with mice that have a large delay
between the button press event and the button release event. The built-
in trackpad and buttons in my laptop do NOT trigger the problem, but my
external mouse does. (The external mouse came with my Wacom Bamboo
CTE-450 tablet.) From looking at the timestamps in the "xev" tool, it
appears that the external mouse has a much longer delay between the two
events than the internal mouse (xev output is attached).
The problem can be avoided in two ways, but neither is convenient:
1) By holding down the right mouse button, moving the mouse over the desired
context menu entry, and then releasing the right mouse button.
2) By moving the mouse left and/or up while clicking, so that the mouse button
is released quickly but at a different location on screen that is not over the
context menu.
Note that slowly moving the mouse to another area of the screen and
releasing does NOT work because gtk dismisses the context menu if the
button was held down for a certain amount of time before releasing.
The problem only occurs in native gtk apps. Other apps such as Firefox
and OpenOffice are not affected.
To solve the problem, I recommend the following:
1) Create the context menu down-and-right of the mouse pointer, so that
the mouse pointer is not over the first item when the right mouse button
is released.
AND
2) Increase the delay before treating a button release as a distinct
event.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: libgtk2.0-0 2.22.0-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Thu Nov 25 12:04:25 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: gtk+2.0
** Affects: gtk+2.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug maverick
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[regression] With slow mice, opening a right-click context menu immediately
executes the first entry
https://bugs.launchpad.net/bugs/681567
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