Issue 198080: Fix SHINDIG-1281

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M :	edit review message
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J / K :	jump to next file with a comment after / before current file
	Side-by-side diff
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j / k :	jump to patch after / before current patch
o / <Enter> :	open current patch in side-by-side view
i :	open current patch in unified diff view

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<Ctrl> + s or <Ctrl> + Enter :	save comment
<Esc> :	cancel edit