Optimize search for composable characters in redisplay

Optimize search for composable characters in redisplay

* src/composite.c (composition_compute_stop_pos): Accept new
argument INCLUDE_STATIC, and look for potential static
compositions only if this argument is non-zero.
* src/xdisp.c:
* src/composite.c:
* src/indent.c: All callers adjusted.
* src/xdisp.c (compute_stop_pos): Don't search for static
compositions.  Search for automatic compositions only after the
iterator gets past the composition stop_pos computed last time.
Use a better position for limiting search for automatic
compositions.  (Bug#62780)