Change key bindings for folding in PGCodeMirror. (Hotfix of #2594) #2597
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By default code mirror uses Shift-Ctrl-F for find/replace and Shift-Ctrl-G for find previous. These key bindings were overwritten when folding was added.
This changes the fold binding to Shift-Ctrl-[ (or Shift-Cmd-[), fold all to Ctrl-Alt-[ (Cmd-Alt-[) and unfold all to Ctrl-Alt-] (Cmd-Alt-]), so they no longer interfere with the find/replace key bindings.