Commit 28514cd9 authored by Gerd Moellmann's avatar Gerd Moellmann
Browse files

(unwind_redisplay): New. Resets flag redisplaying_p.

(redisplay_internal): Register unwind_redisplay with
(try_window_reusing_current_matrix): If new start > old start,
give up if start pos of first reusable row is not equal to new
parent fbad6f9a
......@@ -600,6 +600,7 @@ enum move_it_result
/* Function prototypes. */
static Lisp_Object unwind_redisplay P_ ((Lisp_Object));
static int string_char_and_length P_ ((unsigned char *, int, int *));
static struct text_pos display_prop_end P_ ((struct it *, Lisp_Object,
struct text_pos));
......@@ -6355,6 +6356,7 @@ redisplay_internal (preserve_echo_area)
int must_finish = 0;
struct text_pos tlbufpos, tlendpos;
int number_of_visible_frames;
int count;
/* Non-zero means redisplay has to consider all windows on all
frames. Zero means, only selected_window is considered. */
......@@ -6385,10 +6387,16 @@ redisplay_internal (preserve_echo_area)
/* I don't think this happens but let's be paranoid. */
if (redisplaying_p)
/* Record a function that resets redisplaying_p to its old value
when we leave this function. */
count = specpdl_ptr - specpdl;
record_unwind_protect (unwind_redisplay, make_number (redisplaying_p));
/* If new fonts have been loaded that make a glyph matrix adjustment
......@@ -6976,8 +6984,7 @@ redisplay_internal (preserve_echo_area)
if (--redisplaying_p < 0)
redisplaying_p = 0;
unbind_to (count, Qnil);
......@@ -7009,6 +7016,18 @@ redisplay_preserve_echo_area ()
/* Function registered with record_unwind_protect in
redisplay_internal. Clears the flag indicating that a redisplay is
in progress. */
static Lisp_Object
unwind_redisplay (old_redisplaying_p)
Lisp_Object old_redisplaying_p;
redisplaying_p = XFASTINT (old_redisplaying_p);
/* Mark the display of windows in the window tree rooted at WINDOW as
accurate or inaccurate. If FLAG is non-zero mark display of WINDOW
as accurate. If FLAG is zero arrange for WINDOW to be redisplayed
......@@ -8701,14 +8720,11 @@ try_window_reusing_current_matrix (w)
/* Give up if there is no row to reuse. */
if (MATRIX_ROW_BOTTOM_Y (first_reusable_row) >= yb
|| !first_reusable_row->enabled_p)
|| !first_reusable_row->enabled_p
|| (MATRIX_ROW_START_CHARPOS (first_reusable_row)
!= CHARPOS (new_start)))
return 0;
/* The row we found must start at new_start, or else something
is broken. */
xassert (MATRIX_ROW_START_CHARPOS (first_reusable_row)
== CHARPOS (new_start));
/* We can reuse fully visible rows beginning with
first_reusable_row to the end of the window. Set
first_row_to_display to the first row that cannot be reused.
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