Spurious no-op edit occurs when ctrl+clicking menu bar

[peterflynn]

This occurs in sprint-9 too, so it predates the context menu work. Very strange bug...

1. Open a file
2. Select some text
3. Ctrl+click a top-level menu in the menu bar (e.g. Navigate)

Result: File is marked dirty, but the text does not appear to have been changed (although your selection is lost). If you undo, the dirty flag goes away, but the text again does not change.

Expected: Nothing should happen (other than the menu opening).

[peterflynn]

Under the hood, CodeMirror is generating an edit that replaces the selection with the exact same text. Not sure why.

[pthiess]

Reviewed, seems related to #1111

[redmunds]

Added Mac-only tag. Interesting that this does not seem to reproduce in brackets-shell. @peterflynn can you reproduce this in brackets-shell? If not, then it may not be worth the effort.

[peterflynn]

Yep, confirmed -- still repros in brackets-app but not in brackets-shell. CEF must have been sending bad events to CodeMirror.

[redmunds]

Closing.