Possibility to mark rectangle for clipboard.
User may bind keys to move-cursor-up, move-cursor-down, move-cursor-left,
move-cursor-right and mark-clipboard.
mark-clipboard is tristate.
First triggerred, it remembers left top corner of rectangle. Now you can move cursor.
Second time triggerred, remembers right bottom corner of rectangle.
Third time, it clears selection.
The copy-clipboard action was changed. Now if the clipboard rectangle is marked,
it copies this rectangle. If not, the current link.
I didn’t respect the right order when I added the functions to move up and down
by half a page a few years ago.
Signed-off-by: Fabienne Ducroquet <fabiduc@gmail.com>
move-link-down-line moves the cursor down to the line with a link.
move-link-up-line moves the cursor up to the line with a link.
move-link-prev-line moves to the previous link horizontally.
move-link-next-line moves to the next link horizontally.
(cherry picked from commit 8259a56e99)
