[vim/vim] Speed up text property redraw in win_line() (PR #19880)

[mattn]

This reduces redraw overhead for text properties in win_line() by avoiding repeated sorting when the active property set has not changed, using stack storage for small property/index arrays, and precomputing whether trailing virtual text still follows.

The effect is small for simple cases and grows with the number of active text properties on a line. In redraw-heavy cases with many overlapping properties, this cuts a noticeable amount of time from screen updates.

Case	vim_master	this branch	Improvement
1 prop/line	0.181s median	0.185s median	-2.2%
8 props/line	0.308s median	0.270s median	12.3%
32 props/line	1.475s median	0.955s median	35.3%

A longer redraw benchmark with heavily overlapping text properties showed:

Benchmark	vim_master avg	this branch avg	Improvement
overlap redraw long	1.517s	1.016s	33.0%

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/19880

Commit Summary

• 30377dd Speed up textprop redraw in win_line()

File Changes

(1 file)

• M src/drawline.c (100)

Patch Links:

• https://github.com/vim/vim/pull/19880.patch
• https://github.com/vim/vim/pull/19880.diff

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