To reproduce the issue:
1. Open the attached HTML test case.
2. Click in the iframe area, a caret should appear indicating the area is editable.
3. Press any Meta combination that's not Meta-I or Meta-B, the correct keycode should be printed out in the editing area.
Created attachment 20765 [details]
This issue is causing the bug https://dev.fckeditor.net/ticket/1701 in FCKeditor.
Similarly perhaps, Command-I cannot be used in Safari to invoke the Mail Contents of This Page command when in editable text (<rdar://problem/5845299>).
*** Bug 25604 has been marked as a duplicate of this bug. ***
I looked into this a little yesterday. We're short-circuiting handling of these events. I didn't quite know how to hook into the NSResponder/NSTextField model in order to process the key events at the right time however. It seems we might have to implement our own processKeyEvents: which is called from the EditorClient handleKeyEvent callback. I should post actual stack traces in the bug for more intelligent discussion.