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List:       kde-bugs-dist
Subject:    [kwin] [Bug 348298] New: Alt-tab shortcut does nothing (no window walking possible, using Neo layout
From:       Hans Meine <hans_meine () gmx ! net>
Date:       2015-05-27 11:02:03
Message-ID: bug-348298-17878 () http ! bugs ! kde ! org/
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https://bugs.kde.org/show_bug.cgi?id=348298

            Bug ID: 348298
           Summary: Alt-tab shortcut does nothing (no window walking
                    possible, using Neo layout)
           Product: kwin
           Version: 5.2.2
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: tabbox
          Assignee: kwin-bugs-null@kde.org
          Reporter: hans_meine@gmx.net

I have just set up a new machine with Kubuntu 15.04, not re-using any KDE
settings folder, and found that Alt-Tab does not work.  I suspect the problem
to be related to my unusual keyboard layout (German Neo layout).

Maybe the product/component should even be changed to the global shortcut
handler?

Other shortcuts work (except Shift-Alt-Tab for reverse walking), and I tried to
change the shortcut, with the following results:
* Setting it to None and back to Alt-Tab does not work.  Alt-Tab is properly
recognized and set by the shortcut widget, yet the shortcut does not lead to
any action.
* (Shift-)Meta-Tab also does not work, even though it is recognized in the
settings widget. (I confirmed to reassign from the activity switching actions.
As expected, no reassignment dialog appeared for Alt-Tab.)
* Alt-X works (in the Neo layout, X is the key next to Alt, labeled Q on
typical hardware).

This is the xev output for pressing Alt-Tab:

KeyPress event, serial 37, synthetic NO, window 0x8800001,
    root 0x293, subw 0x0, time 5181172, (-304,488), root:(478,512),
    state 0x0, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XmbLookupString gives 0 bytes: 
    XFilterEvent returns: False

KeyPress event, serial 40, synthetic NO, window 0x8800001,
    root 0x293, subw 0x0, time 5181699, (-304,488), root:(478,512),
    state 0x8, keycode 23 (keysym 0xff09, Tab), same_screen YES,
    XLookupString gives 1 bytes: (09) " "
    XmbLookupString gives 1 bytes: (09) "       "
    XFilterEvent returns: False

KeyRelease event, serial 40, synthetic NO, window 0x8800001,
    root 0x293, subw 0x0, time 5181835, (-304,488), root:(478,512),
    state 0x8, keycode 23 (keysym 0xff09, Tab), same_screen YES,
    XLookupString gives 1 bytes: (09) " "
    XFilterEvent returns: False

KeyRelease event, serial 40, synthetic NO, window 0x8800001,
    root 0x293, subw 0x0, time 5182723, (-304,488), root:(478,512),
    state 0x8, keycode 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes: 
    XFilterEvent returns: False


Reproducible: Always

Steps to Reproduce:
1. Set up Neo layout ("setxkbmap de neo", yet I configured it already in the
Kubuntu installer).
!! You might want to prepare a second terminal with the setxkbmap command for
switching back, because it probably becomes difficult to type with the Neo
layout shuffling nearly all letters. !!
2. Observe that Alt-Tab does not allow to switch between windows.

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