patch 9.0.1747: screenpos() may cause unnecessary redraw Commit: https://github.com/vim/vim/commit/6235a109c48ff2559eca3b16578c429ffb61eadc Author: zeertzjq <zeertzjq@outlook.com> Date: Sat Aug 19 14:12:42 2023 +0200 patch 9.0.1747: screenpos() may cause unnecessary redraw Problem: screenpos() may cause unnecessary redraw. Solution: Don't unnecessarily reset VALID_WROW flag. VALID_WROW flag is only used by two functions: validate_cursor() and cursor_valid(), and cursor_valid() is only used once in ex_sleep(). When adjust_plines_for_skipcol() was first added in patch 9.0.0640, it was called in two functions: comp_botline() and curs_rows(). - comp_botline() is called in two places: - onepage(), which resets VALID_WROW flag immediately afterwards. - validate_botline_win(), where resetting a VALID_ flag is strange. - curs_rows() is called in two places: - curs_columns(), which sets VALID_WROW flag afterwards. - validate_cline_row(), which is only used by GUI mouse focus. Therefore resetting VALID_WROW there doesn't seem to do anything useful. Also, a w_skipcol check (which resets VALID_WROW flag) was added to check_cursor_moved() in patch 9.0.0734, which seems to make more sense than resetting that flag in the middle of a computation. While at it make adjust_plines_for_skipcol() and textpos2screenpos() a bit less confusing: - Make adjust_plines_for_skipcol() return "off" instead of "n - off". - Use 0-based "row" in textpos2screenpos() until W_WINROW is added. closes: #12832 Signed-off-by: Christian Brabandt <cb@256bit.org> Co-authored-by: zeertzjq <zeertzjq@outlook.com>

" Vim syntax file
" Language:      ART-IM and ART*Enterprise
" Maintainer:    Dorai Sitaram <ds26@gte.com>
" URL:		 http://www.ccs.neu.edu/~dorai/vimplugins/vimplugins.html
" Last Change:   2011 Dec 28 by Thilo Six

if exists("b:current_syntax")
  finish
endif

let s:cpo_save = &cpo
set cpo&vim

syn case ignore

syn keyword artspform => and assert bind
syn keyword artspform declare def-art-fun deffacts defglobal defrule defschema do
syn keyword artspform else for if in$ not or
syn keyword artspform progn retract salience schema test then while

syn match artvariable "?[^ \t";()|&~]\+"

syn match artglobalvar "?\*[^ \t";()|&~]\+\*"

syn match artinstance "![^ \t";()|&~]\+"

syn match delimiter "[()|&~]"

syn region string start=/"/ skip=/\\[\\"]/ end=/"/

syn match number "\<[-+]\=\([0-9]\+\(\.[0-9]*\)\=\|\.[0-9]\+\)\>"

syn match comment ";.*$"

syn match comment "#+:\=ignore" nextgroup=artignore skipwhite skipnl

syn region artignore start="(" end=")" contained contains=artignore,comment

syn region artignore start=/"/ skip=/\\[\\"]/ end=/"/ contained

hi def link artinstance type
hi def link artglobalvar preproc
hi def link artignore comment
hi def link artspform statement
hi def link artvariable function

let b:current_syntax = "art"

let &cpo = s:cpo_save
unlet s:cpo_save