Fix bug #16151 with background of display margins.

 src/xdisp.c (extend_face_to_end_of_line): Extend background of
 non-default face in margin areas as well.  (Bug#16151)
 (display_line): Call extend_face_to_end_of_line for continued
 lines as well, if the display margins have non-zero width.
 (set_glyph_string_background_width): When needed, set the
 extends_to_end_of_line_p flag on glyph strings to be drawn in
 margin areas, not only in the text area.

2 files changed, 89 insertions, 5 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index ccf107e307b..90b6525a55d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,13 @@
 2013-12-15  Eli Zaretskii  <eliz@gnu.org>
 
+        * xdisp.c (extend_face_to_end_of_line): Extend background of
+        non-default face in margin areas as well.  (Bug#16151)
+        (display_line): Call extend_face_to_end_of_line for continued
+        lines as well, if the display margins have non-zero width.
+        (set_glyph_string_background_width): When needed, set the
+        extends_to_end_of_line_p flag on glyph strings to be drawn in
+        margin areas, not only in the text area.
+
         * frame.h (FRAME_MOUSE_UPDATE): Fix a typo that caused infloop at
         startup.
 
diff --git a/src/xdisp.c b/src/xdisp.c
index b5274b53229..bd57dc9e278 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -18808,10 +18808,14 @@ extend_face_to_end_of_line (struct it *it)
      1-``pixel'' wide, so they hit the equality too early.  This grace
      is needed only for R2L rows that are not continued, to produce
      one extra blank where we could display the cursor.  */
-  if (it->current_x >= it->last_visible_x
-      + (!FRAME_WINDOW_P (f)
-         && it->glyph_row->reversed_p
-         && !it->glyph_row->continued_p))
+  if ((it->current_x >= it->last_visible_x
+       + (!FRAME_WINDOW_P (f)
+          && it->glyph_row->reversed_p
+          && !it->glyph_row->continued_p))
+      /* If the window has display margins, we will need to extend
+         their face even if the text area is filled.  */
+      && !(WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+           || WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0))
     return;
 
   /* The default face, possibly remapped. */
@@ -18859,6 +18863,20 @@ extend_face_to_end_of_line (struct it *it)
           it->glyph_row->glyphs[TEXT_AREA][0].face_id = face->id;
           it->glyph_row->used[TEXT_AREA] = 1;
         }
+      if (WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+          && it->glyph_row->used[LEFT_MARGIN_AREA] == 0)
+        {
+          it->glyph_row->glyphs[LEFT_MARGIN_AREA][0] = space_glyph;
+          it->glyph_row->glyphs[LEFT_MARGIN_AREA][0].face_id = face->id;
+          it->glyph_row->used[LEFT_MARGIN_AREA] = 1;
+        }
+      if (WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0
+          && it->glyph_row->used[RIGHT_MARGIN_AREA] == 0)
+        {
+          it->glyph_row->glyphs[RIGHT_MARGIN_AREA][0] = space_glyph;
+          it->glyph_row->glyphs[RIGHT_MARGIN_AREA][0].face_id = face->id;
+          it->glyph_row->used[RIGHT_MARGIN_AREA] = 1;
+        }
 #ifdef HAVE_WINDOW_SYSTEM
       if (it->glyph_row->reversed_p)
         {
@@ -18932,11 +18950,61 @@ extend_face_to_end_of_line (struct it *it)
       else
         it->face_id = face->id;
 
+      face = FACE_FROM_ID (f, it->face_id);
+      if (WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+          && (it->glyph_row->used[LEFT_MARGIN_AREA]
+              < WINDOW_LEFT_MARGIN_WIDTH (it->w))
+          && !it->glyph_row->mode_line_p
+          && face && face->background != FRAME_BACKGROUND_PIXEL (f))
+        {
+          struct glyph *g = it->glyph_row->glyphs[LEFT_MARGIN_AREA];
+          struct glyph *e = g + it->glyph_row->used[LEFT_MARGIN_AREA];
+
+          for (it->current_x = 0; g < e; g++)
+            it->current_x += g->pixel_width;
+
+          it->area = LEFT_MARGIN_AREA;
+          while (it->glyph_row->used[LEFT_MARGIN_AREA]
+                 < WINDOW_LEFT_MARGIN_WIDTH (it->w))
+            {
+              PRODUCE_GLYPHS (it);
+              /* term.c:produce_glyphs advances it->current_x only for
+                 TEXT_AREA.  */
+              it->current_x += it->pixel_width;
+            }
+
+          it->current_x = saved_x;
+          it->area = TEXT_AREA;
+        }
+
       PRODUCE_GLYPHS (it);
 
       while (it->current_x <= it->last_visible_x)
         PRODUCE_GLYPHS (it);
 
+      if (WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0
+          && (it->glyph_row->used[RIGHT_MARGIN_AREA]
+              < WINDOW_RIGHT_MARGIN_WIDTH (it->w))
+          && !it->glyph_row->mode_line_p
+          && face && face->background != FRAME_BACKGROUND_PIXEL (f))
+        {
+          struct glyph *g = it->glyph_row->glyphs[RIGHT_MARGIN_AREA];
+          struct glyph *e = g + it->glyph_row->used[RIGHT_MARGIN_AREA];
+
+          for ( ; g < e; g++)
+            it->current_x += g->pixel_width;
+
+          it->area = RIGHT_MARGIN_AREA;
+          while (it->glyph_row->used[RIGHT_MARGIN_AREA]
+                 < WINDOW_RIGHT_MARGIN_WIDTH (it->w))
+            {
+              PRODUCE_GLYPHS (it);
+              it->current_x += it->pixel_width;
+            }
+
+          it->area = TEXT_AREA;
+        }
+
       /* Don't count these blanks really.  It would let us insert a left
          truncation glyph below and make us set the cursor on them, maybe.  */
       it->current_x = saved_x;
@@ -19789,6 +19857,9 @@ display_line (struct it *it)
                         }
                       else if (it->bidi_p)
                         RECORD_MAX_MIN_POS (it);
+                      if (WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+                          || WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0)
+                        extend_face_to_end_of_line (it);
                     }
                   else if (CHAR_GLYPH_PADDING_P (*glyph)
                            && !FRAME_WINDOW_P (it->f))
@@ -19817,6 +19888,9 @@ display_line (struct it *it)
                       it->max_descent = descent;
                       it->max_phys_ascent = phys_ascent;
                       it->max_phys_descent = phys_descent;
+                      if (WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+                          || WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0)
+                        extend_face_to_end_of_line (it);
                     }
                   else if (wrap_row_used > 0)
                     {
@@ -19861,6 +19935,9 @@ display_line (struct it *it)
                       row->continued_p = 1;
                       glyph->pixel_width = it->last_visible_x - x;
                       it->starts_in_middle_of_char_p = 1;
+                      if (WINDOW_LEFT_MARGIN_WIDTH (it->w) > 0
+                          || WINDOW_RIGHT_MARGIN_WIDTH (it->w) > 0)
+                        extend_face_to_end_of_line (it);
                     }
                   else
                     {
@@ -23796,7 +23873,6 @@ set_glyph_string_background_width (struct glyph_string *s, int start, int last_x
      the drawing area, set S->extends_to_end_of_line_p.  */
 
   if (start == s->row->used[s->area]
-      && s->area == TEXT_AREA
       && ((s->row->fill_line_p
            && (s->hl == DRAW_NORMAL_TEXT
                || s->hl == DRAW_IMAGE_RAISED