master updated (77882158b2 -> db03eda636)

[Gregory Heytings]

ghe pushed a change to branch master.

      from  77882158b2 Also update after buffer flip caused by flush_frame
      adds  874e252503 Improve font locking in buffers with long lines 
(bug#56682).
      adds  304e2a3a05 Avoid assertion violations in 'handle_fontified_prop'
      adds  350e97d78e Speed up redisplay of long truncated lines
      adds  fc53961c1d Avoid calling 'current_column' in buffers with long 
lines.
      adds  57a978fd74 Optimize 'set_vertical_scroll_bar' for long lines
      adds  280b8c96cc Improve display of columns on mode-line
      adds  cd41ce8c6c Improvement for long lines in buffers with font locking.
      adds  a25cd7f68a Speed up Isearch in very long lines under line truncation
      adds  4313c695cd ; Fix typos in comments and remove debug code.
      adds  2bab0f2db6 Minor update of truncate-line optimization
      adds  d3c4833d13 Add an optional 'lock' parameter to 'narrow-to-region'
      adds  67a218d339 Final documentation tweaks.
      adds  c6029ed34e Minor improvements of recent documentation changes
      adds  cdaa3b51f1 Further minor improvements of documentation
       new  db03eda636 Merge branch 'feature/long-lines-and-font-locking'


Summary of changes:
 doc/lispref/display.texi   |   6 ++
 doc/lispref/positions.texi |  11 +-
 etc/NEWS                   |  27 +++--
 src/bytecode.c             |   2 +-
 src/dispextern.h           |   8 +-
 src/editfns.c              |  75 +++++++++++--
 src/indent.c               |   5 +
 src/lread.c                |   2 +-
 src/process.c              |   2 +-
 src/xdisp.c                | 256 +++++++++++++++++++++++++++++++++++++++------
 10 files changed, 339 insertions(+), 55 deletions(-)