Color entire replace block same background shade

If the delete or insert side of a replace block is smaller than
the other side, we now color the entire smaller side of the block
with the red (or green) background, rather than a mixture of color
and grey.  This is visually more appealing because we don't have
a run of red-grey-white or green-grey-white in rapid succession.

Change-Id: I58cb94208a1fe7aade7cf354da305355f828c50b
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed