Use hunk background colors on unified views with syntax highlighting

If syntax highlighting was turned on by the user in a unified view,
use the light-red/light-green backgrounds we use in the side-by-side
view to show where lines were added and removed.  This may be a bit
messy, but its useful to see what is going on.

Change-Id: I887ad901810c03906d61432a7b67ef0b813bd9b7
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed