D29445: [KOpenWithDialog] When pointing at a non-executable file print more meaningful error

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Frameworks, VDG.
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REVISION SUMMARY
  `QStandardPaths::findExecutable` only finds executable binaries, so when explicitly pointing it at an existing file, it would complain about it not existing, rather than telling you it's not executable.

TEST PLAN
  - Tried to associate a non-executable shell script with a file: it now told me what was up
  
  Before it would tell me file doesn't exist

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D29445

AFFECTED FILES
  src/widgets/kopenwithdialog.cpp

To: broulik, #frameworks, #vdg
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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