Fix bug #18545 with lack of scrolling a window when point goes out of view.

 src/xdisp.c (cursor_row_fully_visible_p): Update commentary.
 (redisplay_window): Treat the frame's frozen_window_starts flag
 the same way as the optional_new_start flag for the window: only
 obey it if the glyph row showing point will be fully visible.
 Likewise when the window start is in a continuation line.  If,
 after trying everything under the 'force_start' label, point is
 still not fully visible, give up and scroll the window.  Add
 debugging traces.
 src/window.c (Frecenter): Set the window's redisplay flag.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/window.c b/src/window.c
index 7e50282a39b..2210d5bc868 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5897,6 +5897,8 @@ and redisplay normally--don't erase and redraw the frame.  */)
   w->start_at_line_beg = (bytepos == BEGV_BYTE ||
                           FETCH_BYTE (bytepos - 1) == '\n');
 
+  wset_redisplay (w);
+
   set_buffer_internal (obuf);
   return Qnil;
 }