Avoid touching inactive frames

[amosbird]

This causes unexpected frame switches in terminal emacs when frame size changes.

[purcell]

Thanks for submitting this. The change itself feels like bit of a hack, but perhaps just because I don't understand what's actually going wrong. If the frame size changes, the hook should only operate on the current frame. Is there a way to reproduce the issue you're seeing?

[amosbird]

the hook should only operate on the current frame
You mean these hooks?

(dolist (hook '(window-configuration-change-hook
                window-size-change-functions
                after-setting-font-hook
                display-line-numbers-mode-hook))
  (add-hook hook 'page-break-lines--update-display-tables))

Well I'm not sure if it only affects current frame but along with https://github.com/amosbird/realign-mode.el it's reproducible. Just enable both mode in emacs -nw -Q and spawn a bunch of frames visiting different files. Also make sure some of them have ^L. Then change terminal size a bunch of times.

[purcell]

Well I'm not sure if it only affects current frame but along with https://github.com/amosbird/realign-mode.el it's reproducible.

Strange, because that code looks reasonable too, and it's not obvious what's happening or why the proposed fix would consequently be the correct one. This would require some debugging to understand what's going on.