… implementation and Freedesktop portal.
This is an alternative to commit ef9c483771 (`master` branch) for the
2.10 series. On the dev branch, we simply get rid of the KDE portal
implementation, on the basis that by the time that GIMP 3 gets released,
most KDE users will have a recent-enough KDE with featureful Freedesktop
portal.
Yet for the 2.10 series, I am wary that there might still be many KDE
installations where maybe there is not even a Freedesktop portal. So I
just switch the test order. Now we use the X implementation in priority,
if we are running in X (it's still the most featureful and robust
version anyway). Then we test the Freedesktop portal. And finally we
test the KDE portal. I am guessing that if we encounter a KDE
installation with no Freedesktop portal but a KDE one, it's an old
version so we won't have permission issues.
See issue #5785.
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