https://bugs.kde.org/show_bug.cgi?id=366603

            Bug ID: 366603
           Summary: First alt-tab press not handled
           Product: kwin
           Version: 5.7.3
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: effects-tabbox
          Assignee: kwin-bugs-n...@kde.org
          Reporter: mark...@gmail.com

I've notices this for a while now, i think it's since the shared QQmlEngine.
But i was never quite sure if i just mis-pressed alt-tab or if the first one
really didn't get handled. Now i sat down and really test this. It's really not
being handled.

Reproducible: Always

Steps to Reproduce:
1. Restart your Plasma 5 environment. Just killing and restarting plasmashell
does not make this issue visible. Better start with a freshly started
environment form the login manager.
2. Open 2 applications
3. Press alt+tab
4. Nothing happens
5. Press alt+tab again
6. now it works :)

Actual Results:  
Pressing alt+tab for the first time after logging in from the loginmanager (and
starting 2 apps afterwards) does nothing. Pressing alt+tab for the second time
works as expected. Any alt+tab presses afterwards works just fine. 

Expected Results:  
The first alt+tab press should also show the window switcher

I tested this on:
- Intel desktop with nvidia graphics
- intel laptop with intel graphics
- virtualbox environment

All show the very same issue.

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