cquery.el semantic highlighting 问题
- 安装cquery.el，参照wiki/Emacs，需要编译cquery server。用git版吧，Melpa版本不知道更新有多频繁
(setq cquery-sem-highlight-method 'overlay)- 打开一个 .cc 文件，M-x lsp-cquery-enable
新打开文件或保存时cquery server会发送 $cquery/publishSemanticHighlighting，即一系列区间和符号信息。cquery.el 会对于每个区间，用 overlay 贴上色块。原来采取的方法是：
for each range
(goto-char (point-min))
(forward-line start-line) (forward-char start-col) 设置start-point
(goto-char (point-min))
(forward-line end-line) (forward-char end-col) 设置end-point
放置一个overlay覆盖 start-point 和 end-point
goto-char (point-min)次数太多，光标移动幅度大，效率很低，因此 `cquery--publish-semantic-highlighting' is very slow · Issue #7 · cquery-project/emacs-cquery · GitHub @yyjjl 对区间起点排序后用了一个增量式 forward-line 的方法。代码见 Revert "Improve performance of cquery--publish-semantic-highlighting … · cquery-project/emacs-cquery@4ddfef4 · GitHub 被revert的部分。这里摘录部分：
(setq ranges
(sort ranges (lambda (x y) (< (caar x) (caar y)))))
(ignore-errors
(save-excursion
(goto-char (point-min))
(cl-loop
for (start end face) in ranges do
(forward-line (- (car start) last-line-number))
(forward-char (cdr start))
;; start of range
(setq range-start (point))
(setq last-line-number (car start))
(save-excursion
(forward-line (- (car end) (car start)))
(forward-char (cdr end))
;; end of range
(setq range-end (point)))
(cquery--make-sem-highlight (cons range-start range-end) buffer face)
)))))))))))
然而这样做，某些.cc文件会显示异常，例如如图的indexer.h
如果用原来的愚蠢办法则显示正常。forward-line 有什么奇怪特性吗？
