protz/GMail-Conversation-View — pull request #573 by wjt (2012-02-15 11:34:14+00:00)
Title: message.js: don't steal tab-switching shortcuts

Previously, hitting Alt-1 through Alt-0 while the messages pane had
focus did not switch to that tab; it toggled the corresponding flag on
the current message. In stock Thunderbird, only unmodified 1 through 9
toggles flags, and only unmodified 0 clears them. So the fix here is to
ignore key events with modifiers set.

Fixes #572.