(grow_mini_window): Handle case that the root

window is already smaller than the nominal mininum height.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/window.c b/src/window.c
index 0c095c1a826..5f122976d9b 100644
--- a/src/window.c
+++ b/src/window.c
@@ -3751,7 +3751,9 @@ grow_mini_window (w, delta)
     {
       int min_height = window_min_size (root, 0, 0, 0);
       if (XFASTINT (root->height) - delta < min_height)
-        delta = XFASTINT (root->height) - min_height;
+        /* Note that the roor window may already be smaller than
+           min_height.  */
+        delta = max (0, XFASTINT (root->height) - min_height);
     }
     
   if (delta)