https://bugs.kde.org/show_bug.cgi?id=315926

            Bug ID: 315926
           Summary: Some windows cannot be made visible
    Classification: Unclassified
           Product: kwin
           Version: git master
          Platform: Other
                OS: Linux
            Status: CONFIRMED
          Severity: normal
          Priority: NOR
         Component: core
          Assignee: kwin-bugs-null@kde.org
          Reporter: kiagiadakis.george@gmail.com

I am a gentoo user, normally building all of kde from git master. For quite
some time now (~3 months I think), I hadn't upgraded KDE. Recently, however, I
decided to upgrade it to the latest git master. After the upgrade, I discovered
a serious regression in kwin.

The bug is that the windows of certain applications cannot be made visible,
ever. So far, I have noted two affected applications:
* KeepassX
* ktp-text-ui

Both applications have something in common: They normally open without a
window. Keepassx has a systray icon, which can be used to toggle the main
window. ktp-text-ui opens in the background, waiting to handle a telepathy text
channel; when that happens, it opens a window with the chat. However, this is
something that other, unaffected, applications do as well. For example,
clementine, skype and kgpg are not affected.

Switching to another window manager (I tried openbox) fixes the problem.

One other symptom: Under KDE Plasma desktop, the taskbar does not show entries
for those windows either. Under Razor-qt with kwin, however, the windows are
properly shown in the taskbar, although they are still not visible.

Disabling desktop effects does not solve the issue.

Reproducible: Always

Steps to Reproduce:
1. Install a recent kwin and kde-telepathy
2. Try to open a chat with a contact from the contact list

Actual Results:  
Chat window opens in the background (according to terminal output, if you
investigate it), although it is not visible on the desktop

Expected Results:  
Show the window

I am using a dual head setup with one desktop spanning on two monitors.

% glxinfo |grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RS780
OpenGL version string: 3.0 Mesa 9.1-devel
OpenGL shading language version string: 1.30
OpenGL extensions:

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