Remove buggy non-native image scrolling

[gnu-emacs] / src / dispnew.c

diff --git a/src/dispnew.c b/src/dispnew.c
index 64c84aec6f9319217a71bd790d24f90e28295aa4..3a0532a693b0047910289cef8f78fa183380e39c 100644 (file)
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -1,14 +1,14 @@
 /* Updating of data structures for redisplay.
 
-Copyright (C) 1985-1988, 1993-1995, 1997-2015 Free Software Foundation,
+Copyright (C) 1985-1988, 1993-1995, 1997-2016 Free Software Foundation,
 Inc.
 
 This file is part of GNU Emacs.
 
 GNU Emacs is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
 
 GNU Emacs is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -39,6 +39,7 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #include "syssignal.h"
 #include "systime.h"
 #include "tparam.h"
+#include "xwidget.h"
 
 #ifdef HAVE_WINDOW_SYSTEM
 #include TERM_HEADER
@@ -320,7 +321,9 @@ margin_glyphs_to_reserve (struct window *w, int total_glyphs, int margin)
       int width = w->total_cols;
       double d = max (0, margin);
       d = min (width / 2 - 1, d);
-      return (int) ((double) total_glyphs / width * d);
+      /* Since MARGIN is positive, we cannot possibly have less than
+        one glyph for the marginal area.  */
+      return max (1, (int) ((double) total_glyphs / width * d));
     }
   return 0;
 }
@@ -680,7 +683,9 @@ void
 clear_glyph_matrix_rows (struct glyph_matrix *matrix, int start, int end)
 {
   eassert (start <= end);
-  eassert (start >= 0 && start < matrix->nrows);
+  eassert (start >= 0 && (start < matrix->nrows
+                         /* matrix->nrows can be 0 for the initial frame.  */
+                         || (matrix->nrows == 0)));
   eassert (end >= 0 && end <= matrix->nrows);
 
   for (; start < end; ++start)
@@ -3543,6 +3548,7 @@ update_window (struct window *w, bool force_p)
   add_window_display_history (w, w->current_matrix->method, paused_p);
 #endif
 
+  xwidget_end_redisplay (w, w->current_matrix);
   clear_glyph_matrix (desired_matrix);
 
   return paused_p;
@@ -4116,6 +4122,11 @@ scrolling_window (struct window *w, bool header_line_p)
        break;
     }
 
+#ifdef HAVE_XWIDGETS
+  /* Currently this seems needed to detect xwidget movement reliably. */
+    return 0;
+#endif
+
   /* Give up if some rows in the desired matrix are not enabled.  */
   if (! MATRIX_ROW_ENABLED_P (desired_matrix, i))
     return -1;
@@ -5660,7 +5671,7 @@ DEFUN ("sleep-for", Fsleep_for, Ssleep_for, 1, 2, 0,
 SECONDS may be a floating-point value, meaning that you can wait for a
 fraction of a second.  Optional second arg MILLISECONDS specifies an
 additional wait period, in milliseconds; this is for backwards compatibility.
-(Not all operating systems support waiting for a fraction of a second.)  */)
+\(Not all operating systems support waiting for a fraction of a second.)  */)
   (Lisp_Object seconds, Lisp_Object milliseconds)
 {
   double duration = extract_float (seconds);
@@ -6206,10 +6217,10 @@ It is up to you to set this variable if your terminal can do that.  */);
               doc: /* Name of the window system that Emacs uses for the first frame.
 The value is a symbol:
  nil for a termcap frame (a character-only terminal),
- 'x' for an Emacs frame that is really an X window,
- 'w32' for an Emacs frame that is a window on MS-Windows display,
- 'ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
- 'pc' for a direct-write MS-DOS frame.
+ `x' for an Emacs frame that is really an X window,
+ `w32' for an Emacs frame that is a window on MS-Windows display,
+ `ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
+ `pc' for a direct-write MS-DOS frame.
 
 Use of this variable as a boolean is deprecated.  Instead,
 use `display-graphic-p' or any of the other `display-*-p'
@@ -6219,10 +6230,10 @@ predicates which report frame's specific UI-related capabilities.  */);
                 doc: /* Name of window system through which the selected frame is displayed.
 The value is a symbol:
  nil for a termcap frame (a character-only terminal),
- 'x' for an Emacs frame that is really an X window,
- 'w32' for an Emacs frame that is a window on MS-Windows display,
- 'ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
- 'pc' for a direct-write MS-DOS frame.
+ `x' for an Emacs frame that is really an X window,
+ `w32' for an Emacs frame that is a window on MS-Windows display,
+ `ns' for an Emacs frame on a GNUstep or Macintosh Cocoa display,
+ `pc' for a direct-write MS-DOS frame.
 
 Use of this variable as a boolean is deprecated.  Instead,
 use `display-graphic-p' or any of the other `display-*-p'