(WINDOW_WANTS_MODELINE_P): Check window height > 1.

(WINDOW_WANTS_HEADER_LINE_P): Check window height provides room.

1 files changed, 8 insertions, 6 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 99ee1368182..74726f02559 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1112,20 +1112,22 @@ extern struct glyph_row scratch_glyph_row;
 /* Value is non-zero if window W wants a mode line.  */
 
 #define WINDOW_WANTS_MODELINE_P(W)                                      \
-     (!MINI_WINDOW_P (W)                                                \
+     (!MINI_WINDOW_P ((W))                                              \
       && !(W)->pseudo_window_p                                          \
-      && FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME (W)))             \
+      && FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME ((W))))           \
       && BUFFERP ((W)->buffer)                                          \
-      && !NILP (XBUFFER ((W)->buffer)->mode_line_format))
+      && !NILP (XBUFFER ((W)->buffer)->mode_line_format)                \
+      && (W)->height > 1)
 
 /* Value is non-zero if window W wants a header line.  */
 
 #define WINDOW_WANTS_HEADER_LINE_P(W)                                   \
-     (!MINI_WINDOW_P (W)                                                \
+     (!MINI_WINDOW_P ((W))                                              \
       && !(W)->pseudo_window_p                                          \
-      && FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME (W)))             \
+      && FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME ((W))))           \
       && BUFFERP ((W)->buffer)                                          \
-      && !NILP (XBUFFER ((W)->buffer)->header_line_format))
+      && !NILP (XBUFFER ((W)->buffer)->header_line_format)              \
+      && (W)->height > 1 + !NILP (XBUFFER ((W)->buffer)->mode_line_format))
 
      
 /***********************************************************************