1 files changed, 7 insertions, 5 deletions

diff --git a/src/window.c b/src/window.c
index 6fe78166ba1..4e8ad699500 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2665,9 +2665,8 @@ window_fixed_size_p (w, width_p, check_siblings_p)
 }
 
 /* Return the minimum size for leaf window W.  WIDTH_P non-zero means
-   take into account fringes and the scrollbar of W.  WIDTH_P zero
-   means take into account mode-line and header-line of W.  Return 1
-   for the minibuffer.  */
+   take into account fringes and the scrollbar of W.  WIDTH_P zero means
+   take into account mode-line of W.  Return 1 for the minibuffer.  */
 
 static int
 window_min_size_2 (w, width_p)
@@ -2686,8 +2685,11 @@ window_min_size_2 (w, width_p)
   else
     size = max (window_min_height,
                 (MIN_SAFE_WINDOW_HEIGHT
-                 + (WINDOW_WANTS_MODELINE_P (w) ? 1 : 0)
-                 + (WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0 )));
+                 /* Don't count the header-line here.  It would break
+                    splitting a window with a header-line when the new
+                    window shall have a height of two (calculator does
+                    that). */
+                 + (WINDOW_WANTS_MODELINE_P (w) ? 1 : 0)));
 
   return size;
 }