The "save changes before closing" and "find" dialogs are not properly displayed

[mlg7]

"The Cheshire Cat Glitch"

I see this bug on each 4th Ctrl+F dialog and on almost each attempt to close a document tab without saving.

0. I have Eclipse, Code::Blocks and Chromium (many windows of about 6 tabs, Google and Stackoverflow) and Opera (many tabs) running. The last gedit tab reads "Untitled Document 25", the tabs contain copy-paste-d Android debug logs (long).

1. Press the [x] (lose tab) control on, say "Untitled Document 24".

2.
 (what I see) I see a shadow of a dialog but not the dialog itself. The [x] control is still pressed.
 (what I expect) My expectation is that the dialog is shown without any additional steps.

3a. if you move mouse over the dialog (that is not shown but is logically there), the dialog controls appear one by one.

3b. the whole dialog appears on the screen if you launch any application or switch to another application (including an attempt to take a screenshot).

I have seen analogous misbehaviour with the "Find" (Ctrl+F) dialog. Sometimes I have seen the Find dialog partially transparent, like if it began to gradually appear but stopped in the middle. I also see it displayed ok or not displayer at all.

The worst user experience happens while trying to close a modified document: the "save your changes" dialog does not appear, but the document is not closed, and the user has no idea what's going on. And yes, sometimes closing a modified document is a side effect of a shutdown (in which case the shutdown does not happen, and the user just switches the power off).

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gedit 2.30.4-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-13.55-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
Architecture: i386
Date: Thu Mar 1 15:19:44 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110426)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gedit
UpgradeStatus: No upgrade log present (probably fresh install)

[Vadim Rutkovsky (roignac)]

Could you please try to reproduce this in 3.x.x version of gedit? See https://launchpad.net/~gnome3-team/+archive/gnome3 for Natty PPA

[mlg7 (mlg7)]

Now I see the same (or a similar) bug in other programs too:
after 3 non-working days the login screen showed me just a text field instead of a dialog;
Mozilla Thunderbird showed a naked progress bar and the dialog has appeared
only at the moment before closing.
And I see the same misbehaviour in Eclipse.

Windows used to misbehave this way due to a graphics handle leak.

I think, gedit is a wrong component. What component is affected then?

[mlg7 (mlg7)]

I have managed to obtain at least some screenshot. (Usually when you launch or switch to another application, including "take screenshot", the dialog gets drawn correctly.)