* src/group.c (groups_merge): don't merge a group with itself.

* src/bar.c (draw_mark): abort if mark_end is the beginning of the
line or the start and end of the mark is the same.

2 files changed, 8 insertions, 3 deletions

diff --git a/src/bar.c b/src/bar.c
index 7ff0691..22ce0b5 100644
--- a/src/bar.c
+++ b/src/bar.c
@@ -397,9 +397,6 @@ get_mark_box (char *msg, int mark_start, int mark_end,
   int start_line_beginning;
   int end_line_beginning;
 
-  if (mark_end == 0)
-    return;
-
   /* If the mark_end is on a new line or the end of the string, then
      back it up one character. */
   if (msg[mark_end-1] == '\n' || mark_end == strlen (msg))
@@ -480,6 +477,10 @@ draw_mark (rp_screen *s, char *msg, int mark_start, int mark_end)
 {
   int x, y, width, height;
 
+  /* when this happens, there is no mark. */
+  if (mark_end == 0 || mark_start == mark_end)
+    return;
+
   get_mark_box (msg, mark_start, mark_end, 
 		&x, &y, &width, &height);
   draw_inverse_box (s, x, y, width, height);
diff --git a/src/group.c b/src/group.c
index 80ab89e..38b0fd3 100644
--- a/src/group.c
+++ b/src/group.c
@@ -443,6 +443,10 @@ groups_merge (rp_group *from, rp_group *to)
   rp_window_elem *cur;
   struct list_head *iter, *tmp;
 
+  /* Merging a group with itself makes no sense. */
+  if (from == to)
+    return;
+
   /* Move the unmapped windows. */
   list_for_each_safe_entry (cur, iter, tmp, &from->unmapped_windows, node)
     {