(produce_image_glyph): Automatically crop wide images at

right window edge so we can draw the cursor on the same row to
avoid confusing redisplay by placing the cursor outside the visible
window area.

src/xdisp.c

@@ -19786,7 +19786,7 @@ produce_image_glyph (it)
 {
   struct image *img;
   struct face *face;
-  int glyph_ascent;
+  int glyph_ascent, crop;
   struct glyph_slice slice;
   xassert (it->what == IT_IMAGE);
@@ -19894,6 +19894,15 @@ produce_image_glyph (it)
   take_vertical_position_into_account (it);
+  /* Automatically crop wide image glyphs at right edge so we can
+     draw the cursor on same display row.  */
+  if ((crop = it->pixel_width - (it->last_visible_x - it->current_x), crop > 0)
+      && (it->hpos == 0 || it->pixel_width > it->last_visible_x / 4))
+    {
+      it->pixel_width -= crop;
+      slice.width -= crop;
+    }
+
   if (it->glyph_row)
     {
       struct glyph *glyph;