When creating a delta, the copy command could copy from rows that are
bigger than the height of the tile. This would go unnoticed on light
mode because the js side that applied the delta would apply these out of
bounds rows with a white color, but it is noticable in dark mode. Made
it so the copy command stops copying from out of bounds.
Signed-off-by: Paris Oplopoios <paris.oplopoios@collabora.com>
Change-Id: I4d05cb411958d0945933edb5c812de2dfd9c1abd
