Minor update of truncate-line optimization

* src/xdisp.c (forward_to_next_line_start): Look into display and
overlay strings only when lines are truncated on display.

1 files changed, 6 insertions, 5 deletions

diff --git a/src/xdisp.c b/src/xdisp.c
index 66b37a855bc..6237d5a0222 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -7266,7 +7266,8 @@ forward_to_next_line_start (struct it *it, bool *skipped_p,
 
       if (!no_strings_with_newlines)
         {
-          if (!current_buffer->long_line_optimizations_p)
+          if (!(current_buffer->long_line_optimizations_p
+                && it->line_wrap == TRUNCATE))
             {
               /* Quick-and-dirty check: if there isn't any `display'
                  property in sight, and no overlays, we're done.  */
@@ -7280,10 +7281,10 @@ forward_to_next_line_start (struct it *it, bool *skipped_p,
             }
           else
             {
-              /* For buffers with very long lines we try harder,
-                 because it's worth our while to spend some time
-                 looking into the overlays and 'display' properties
-                 to try to avoid iterating through all of them.  */
+              /* For buffers with very long and truncated lines we try
+                 harder, because it's worth our while to spend some
+                 time looking into the overlays and 'display' properties
+                 if we can then avoid iterating through all of them.  */
               no_strings_with_newlines =
                 !strings_with_newlines (start, limit, it->w);
             }