from 9atom/acmearrowfun patch:
reported by mark van atten
In Plan 9 acme, if you type
{}
then go back and type text between the brackets
{Curiouser and curiouser!}
the right arrow is blocked when you want to go over the closing
bracket to continue typing to its right. (If you first go to the left,
and then back to the right, it works.)
Same for the other brackets: [ ], ( ), < >.
noted that brackets are not necessary. same behavior with any
character.
fix is to textcommit before moving.
we'r getting a rectangle taller than a single line from
coladd() which causes textresize() to collapse the tag
text to zero height.
should probably fix coladd() instead.
scrollbars used to put the mouse on the scrollbar while scrolling. if latency
is high, this often results to the cursor jumping back. instead, make button 2
srolling work without needing the mouse to be inside the scrollbar and leave
the mouse position alone.
pread does not guarantee that it would read all the data asked for.
But acme usage of disk assumes that. This issues as many reads as
needed to make acme work when read returns less data than it wanted.
