fix: fixes error when a utility frame is the current frame #837
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On Mac OS X, small frames that don't seem to have any windows may be selected when the process filter is processed. By walking up the parent-frame list, we can get to the frame that the user is actually able to use, and thus the call to (get-mru-window) does not return nil and the whole process filter aborts. Should fix bug emacs-lsp#828
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On Mac OS X, small frames that don't allow user focus may be selected when the process filter is processed. By walking up the parent-frame list, we can get to the frame that the user is actually able to use, and thus the call to (get-mru-window) does not return nil and the whole process filter aborts.
Should fix bug #828