Constrain window body sizes.

* window.c (window_body_height, window_body_width): Don't return
negative value.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/window.c b/src/window.c
index 60ec913ebbf..adde3919699 100644
--- a/src/window.c
+++ b/src/window.c
@@ -866,7 +866,11 @@ window_body_height (struct window *w, bool pixelwise)
                 - WINDOW_MODE_LINE_HEIGHT (w)
                 - WINDOW_BOTTOM_DIVIDER_WIDTH (w));
 
-  return pixelwise ? height : height / FRAME_LINE_HEIGHT (WINDOW_XFRAME (w));
+  /* Don't return a negative value.  */
+  return max (pixelwise
+              ? height
+              : height / FRAME_LINE_HEIGHT (WINDOW_XFRAME (w)),
+              0);
 }
 
 /* Return the number of columns/pixels of W's body.  Don't count columns
@@ -893,7 +897,11 @@ window_body_width (struct window *w, bool pixelwise)
                    ? WINDOW_FRINGES_WIDTH (w)
                    : 0));
 
-  return pixelwise ? width : width / FRAME_COLUMN_WIDTH (WINDOW_XFRAME (w));
+  /* Don't return a negative value.  */
+  return max (pixelwise
+              ? width
+              : width / FRAME_COLUMN_WIDTH (WINDOW_XFRAME (w)),
+              0);
 }
 
 DEFUN ("window-body-height", Fwindow_body_height, Swindow_body_height, 0, 2, 0,