[Konsole-devel] [konsole] [Bug 198175] Konsole should set blur region for the new kwin effect

[Eike Hein via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=198175

--- Comment #75 from Eike Hein <hein at kde.org> ---
> konsole shouldn't set the blur region if the parent app in which it lives sets the blur (Yakuake for instance).

No, I'm saying when TerminalDisplay sets the blur region, it needs to not
replace the blur region but merge its intended blur region with whatever is
already set. This is technically still problematic in the case where
TerminalDisplay's blur region fully contains a blur region "write" by someone
else that it might later unset when disabling blur in the profile, but that's
an extreme edge case probably not worth worrying too much about - I don't know
of any existing app where it would actually be a problem.

> That way, if it gets embedded it should still behave nicely when the parent sets the blur hint for the region it wants.

Then Dolphin needs it's own "Blur behind terminal" option - not really smart.
It's nicer to place it in the Konsole profile options.

The algo is basically:

- catch relevant events for widget geometry change
- get current blur region
- map old widget geo to window
- remove from blur region
- map new widget geo to window
- add to blur region
- set blur region

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