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instead of going through KRun, ie. in Dolphin selecting two script files and hitting return will actually open them in Kate rather than execute them both. This needs to be addressed separately.
~~This particular patch only applies to 5.9 branch since in 5.8 we didn't have execution of multiple files,
~~ (updated the patch now) let's make a fix for 5.8 and then also address the runPreferredApplications thing for 5.9 and then we have everything amazing.