[Bug 306365] New: Clicking several times puts focus on background window

[bugzilla at philip-seeger.de]

https://bugs.kde.org/show_bug.cgi?id=306365

            Bug ID: 306365
          Severity: normal
           Version: unspecified
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: Clicking several times puts focus on background window
    Classification: Unclassified
                OS: Linux
          Reporter: bugzilla at philip-seeger.de
          Hardware: Other
            Status: UNCONFIRMED
         Component: general
           Product: kde

Example 1:
In Firefox, the search bar is visible (Ctrl + F). I keep clicking the "Next"
button for a couple of times. After a few seconds, it behaves as if the mouse
were gone - it's still focused (dotted border line), but the 3D hover effect is
gone (so the button looks just the "Previous" button next to it) and clicks
don't get to this button. Sometimes it seems, as if the clicks reach the window
behind the browser.

Example 2:
A browser window is open, behind it is a terminal window. Both have vertical
scrollbars enabled.
I keep scrolling (mouse wheel) the web page (browser has focus) without moving
the mouse. After a few seconds, the terminal window starts scrolling (in other
words, the wheel action is sent to the terminal window). Sometimes, another
workspace appears, as if the wheel had been used directly on the desktop.

I know that Firefox uses GTK and KDE uses Qt, but the same has happened with Qt
applications too.
I'm not completely sure if this is a KDE issue, but I use KDE as well as
Fluxbox and it only seems to happen in KDE.

Reproducible: Always

Steps to Reproduce:
1. Keep clicking a button quickly (at least twice per second).
2. Don't move the mouse (not even 1 pixel).
3. Mouse somehow gets lost in another dimension.
Actual Results:  
Mouse gets lost in some parallel universe.

Expected Results:  
Clicking (or scrolling with wheel) should for more than 5 seconds.

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