diff: align cell content to the top
This is needed when both sides are unbalanced. For example when a very
long paragraph is replaced by a single sentence, the text in the right
cell will be floating in the middle.
Example using ?action=render-ascii:
PRE PATCH:
+----------------+ +----------------+
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | lot of e |
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | |
+----------------+ +----------------+
POST PATCH:
+----------------+ +----------------+
|eeeeeeeeeeeeeeee| | lot of e |
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | |
|eeeeeeeeeeeeeeee| | |
+----------------+ +----------------+
Part of:
bug 33335 - new color scheme and text display for diffs
follow
r107127