ref: cdc1224233dc2c0de2605d9a555d98b13245f513
parent: 96626d9c10bd37d060f9cf843b717350c222a344
author: Simon Tatham <anakin@pobox.com>
date: Wed Oct 9 16:44:51 EDT 2013
Fix an edge case of divider-obsoletion in Group. When you drag group elements around, previous dividers are meant to dissolve whenever the same two elements are no longer on each side of it. One case in which this didn't happen was that of dragging an element from the left of a divider to the far right column - the divider became invisible, but would then startlingly reappear if you drag that element back to the left of whatever it was left of before. [originally from svn r10051]
--- a/unfinished/group.c
+++ b/unfinished/group.c
@@ -1430,8 +1430,9 @@
/*
* Eliminate any obsoleted dividers.
*/
- for (x = 0; x+1 < w; x++) {- int i = ret->sequence[x], j = ret->sequence[x+1];
+ for (x = 0; x < w; x++) {+ int i = ret->sequence[x];
+ int j = (x+1 < w ? ret->sequence[x+1] : -1);
if (ret->dividers[i] != j)
ret->dividers[i] = -1;
}