Fix calculation of total window sizes after font size changes (Bug#19972).

* frame.c (adjust_frame_size): If the pixel sizes remain
unchanged but the number of lines or columns of the frame
changes, run `window--pixel-to-total' (Bug#19972).
(Qwindow_pixel_to_total): DEFSYM it.
* window.el (window--dump-frame): For pixel height return total
number of frame's lines.

2 files changed, 12 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 930a33b277a..f1bdd150905 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2015-03-03  Martin Rudalics  <rudalics@gmx.at>
+
+        * frame.c (adjust_frame_size): If the pixel sizes remain
+        unchanged but the number of lines or columns of the frame
+        changes, run `window--pixel-to-total' (Bug#19972).
+        (Qwindow_pixel_to_total): DEFSYM it.
+
 2015-03-03  Daniel Colascione  <dancol@dancol.org>
 
         * print.c (print_object): Print whether a finalizer has
diff --git a/src/frame.c b/src/frame.c
index 4a526e228f9..bac2b246ad9 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -537,6 +537,8 @@ adjust_frame_size (struct frame *f, int new_width, int new_height, int inhibit,
         }
 #endif
     }
+  else if (new_cols != old_cols)
+    call2 (Qwindow_pixel_to_total, frame, Qt);
 
   if (new_windows_height != old_windows_height
       /* When the top margin has changed we have to recalculate the top
@@ -551,6 +553,8 @@ adjust_frame_size (struct frame *f, int new_width, int new_height, int inhibit,
       if ((FRAME_TERMCAP_P (f) && !pretend) || FRAME_MSDOS_P (f))
         FrameRows (FRAME_TTY (f)) = new_lines + FRAME_TOP_MARGIN (f);
     }
+  else if (new_lines != old_lines)
+    call2 (Qwindow_pixel_to_total, frame, Qnil);
 
   frame_size_history_add
     (f, Qadjust_frame_size_3, new_text_width, new_text_height,
@@ -4831,6 +4835,7 @@ syms_of_frame (void)
   DEFSYM (Qframep, "framep");
   DEFSYM (Qframe_live_p, "frame-live-p");
   DEFSYM (Qframe_windows_min_size, "frame-windows-min-size");
+  DEFSYM (Qwindow_pixel_to_total, "window--pixel-to-total");
   DEFSYM (Qexplicit_name, "explicit-name");
   DEFSYM (Qheight, "height");
   DEFSYM (Qicon, "icon");