Fix Find in Files invalid directory error #3818
Merged
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When the Find in Files path doesn't exist, the status bar says "Cannot execute grep tool...: Failed to change the working directory. Check the path setting in Preferences". Which is confusing and hides the real problem in the middle of irrelevant text. Instead, show a dialog with the correct error only.
Fixes #1347.
Also show dialogs for no search text & bad search regex errors, rather than status bar messages.