https://bugs.kde.org/show_bug.cgi?id=522490

--- Comment #1 from cwo <[email protected]> ---
After further debugging and testing on #kwin with @zzag:

The crash does not seem to happen on Fedora's 6.7

The crash happens because of the task switcher refreshing the model in response
to the tooltip's internalwindow appearing, and that causes it to focusOut and
hide while it's still in the process of being shown, so is already destroyed
when we're trying to add it.

Thumbnail Grid and Large Icons are not affected, as their GridViews are
unloaded while the Switcher itself is not visible. The ListViews/PathViews in
the other Switchers we ship always exist, so are affected - but only after the
tabbox has been fully shown once, which is why I found that it sometimes worked
for a while after kwin restarted - I hadn't used the tabbox yet.

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