Fix bug #16806 with horizontal scrolling of images when fringes are disabled.

 src/xdisp.c (display_line): Fix horizontal scrolling of large images
 when fringes are turned off.  This comes at a price of not
 displaying the truncation/continuation glyphs in this case.

diff --git a/src/ChangeLog b/src/ChangeLog
index cbc48a7..f89f7e0 100644 (file)
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,10 @@
 2014-02-19  Eli Zaretskii  <eliz@gnu.org>
 
+       * xdisp.c (display_line): Fix horizontal scrolling of large images
+       when fringes are turned off.  This comes at a price of not
+       displaying the truncation/continuation glyphs in this case.
+       (Bug#16806)
+
        * image.c (x_create_x_image_and_pixmap) [HAVE_NTGUI]: If
        CreateDIBSection returns an error indication, zero out *ximg after
        destroying the image.  This avoids crashes in memory allocations

diff --git a/src/xdisp.c b/src/xdisp.c
index d941c7b..b9908c6 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -20119,7 +20119,12 @@ display_line (struct it *it)
       /* If we truncate lines, we are done when the last displayed
         glyphs reach past the right margin of the window.  */
       if (it->line_wrap == TRUNCATE
-         && (FRAME_WINDOW_P (it->f) && WINDOW_RIGHT_FRINGE_WIDTH (it->w)
+         && ((FRAME_WINDOW_P (it->f)
+              /* Images are preprocessed in produce_image_glyph such
+                 that they are cropped at the right edge of the
+                 window, so an image glyph will always end exactly at
+                 last_visible_x, even if there's no right fringe.  */
+              && (WINDOW_RIGHT_FRINGE_WIDTH (it->w) || it->what == IT_IMAGE))
              ? (it->current_x >= it->last_visible_x)
              : (it->current_x > it->last_visible_x)))
        {
@@ -20152,19 +20157,26 @@ display_line (struct it *it)
                  i = row->used[TEXT_AREA] - (i + 1);
                }
 
-             it->current_x = x_before;
-             if (!FRAME_WINDOW_P (it->f))
+             /* produce_special_glyphs overwrites the last glyph, so
+                we don't want that if we want to keep that last
+                glyph, which means it's an image.  */
+             if (it->current_x > it->last_visible_x)
                {
-                 for (n = row->used[TEXT_AREA]; i < n; ++i)
+                 it->current_x = x_before;
+                 if (!FRAME_WINDOW_P (it->f))
+                   {
+                     for (n = row->used[TEXT_AREA]; i < n; ++i)
+                       {
+                         row->used[TEXT_AREA] = i;
+                         produce_special_glyphs (it, IT_TRUNCATION);
+                       }
+                   }
+                 else
                    {
                      row->used[TEXT_AREA] = i;
                      produce_special_glyphs (it, IT_TRUNCATION);
                    }
-               }
-             else
-               {
-                 row->used[TEXT_AREA] = i;
-                 produce_special_glyphs (it, IT_TRUNCATION);
+                 it->hpos = hpos_before;
                }
            }
          else if (IT_OVERFLOW_NEWLINE_INTO_FRINGE (it))
@@ -20183,13 +20195,13 @@ display_line (struct it *it)
                  goto at_end_of_line;
                }
              it->current_x = x_before;
+             it->hpos = hpos_before;
            }
 
          row->truncated_on_right_p = 1;
          it->continuation_lines_width = 0;
          reseat_at_next_visible_line_start (it, 0);
          row->ends_at_zv_p = FETCH_BYTE (IT_BYTEPOS (*it) - 1) != '\n';
-         it->hpos = hpos_before;
          break;
        }
     }
@@ -20203,9 +20215,12 @@ display_line (struct it *it)
       && IT_CHARPOS (*it) != CHARPOS (row->start.pos))
     {
       if (!FRAME_WINDOW_P (it->f)
-         || (row->reversed_p
-             ? WINDOW_RIGHT_FRINGE_WIDTH (it->w)
-             : WINDOW_LEFT_FRINGE_WIDTH (it->w)) == 0)
+         || (((row->reversed_p
+               ? WINDOW_RIGHT_FRINGE_WIDTH (it->w)
+               : WINDOW_LEFT_FRINGE_WIDTH (it->w)) == 0)
+             /* Don't let insert_left_trunc_glyphs overwrite the
+                first glyph of the row if it is an image.  */
+             && row->glyphs[TEXT_AREA]->type != IMAGE_GLYPH))
        insert_left_trunc_glyphs (it);
       row->truncated_on_left_p = 1;
     }