bug#64993: 29.1; scroll-other-window breaks global-hl-line-sticky-flag

[Eli Zaretskii]

tags 64993 notabug
thanks

> From: Spencer Baugh <sbaugh@janestreet.com>
> Date: Tue, 01 Aug 2023 10:59:29 -0400
> 
> 
> 1. emacs -Q
> 2. Eval
> (setq global-hl-line-sticky-flag t)
> (global-hl-line-mode)
> 3. C-h n  (to open up a buffer with lots of text for scrolling)
> 4. C-x 3
> 5. Note the line with point is highlighted in both windows
> 6. scroll-other-window
> 7. Note the line with point is no longer highlighted in the other window

That's a feature, and you activated it by setting
global-hl-line-sticky-flag:

  (defcustom global-hl-line-sticky-flag nil
    "Non-nil means the Global HL-Line mode highlight appears in all windows.

  (define-minor-mode global-hl-line-mode
    "Toggle line highlighting in all buffers (Global Hl-Line mode).

  If `global-hl-line-sticky-flag' is non-nil, Global Hl-Line mode
  highlights the line about the current buffer's point in all live
  windows.

So what you describe as "the line with point is no longer highlighted
in the other window" actually happens before the point in the selected
window is no longer visible in the other window, and thus neither is
the highlighted line.

This is not a bug.