Scroll bar hides during and after editing

[ghost]

Editing a line causes the scroll bar to disappear until the window is scrolled again. It would be nice if it remained visible, and even correctly adjusted itself to the new buffer size and position, if those had changed.

Currently I'm using (defun yascroll:before-change (beg end) nil) as a quick hack to prevent the hiding, but that doesn't update the scroll bar size and position.

[jcs090218]

Try set the variable yascroll:delay-to-hide to nil.

[ghost]

Already done - the same behavior persists. To clarify, the issue is not the automatic hiding after a delay, but specifically editing a buffer that causes the hiding, regardless of time elapsed since last scroll.

[jcs090218]

Can you try the latest version and see if that works? See #39.

[ghost]

Works flawlessly - thank you : )

[ghost]

If only it were that easy. Use of the patched version revealed a performance issue when used with helm-swoop.

Calling helm-swoop is very slow with the patched yascroll version, but quick with the previous version. That is, it takes a long time for the helm-swoop window to open - subsequent searching within the window remains fast. It takes a long time to open regardless if it is the 1st time or not being opened during a session. I.e. it'll be just as slow the 2nd, 3rd, etc.. time it is called.

My guess is that it is expensive to re-render the scroll-bar for each of the many editing operations helm-swoop does to set-up its buffer.

Tested on Emacs 27.1, launched with emacs -q to start with a clean slate, and the following script was loaded with M-x load-file:

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/"))
(package-initialize)
(package-install 'helm)
(require 'helm)

;; Old version, without patch to prevent scroll-bar hiding due to edit.
;; helm-swoop opens fast with this version.
(require 'yascroll)
;; New version, that persists the scroll-bar during edit operations.
;; helm-swoop opens very slowly this version, especially for larger files.
; (load-file "~/yascroll-test/yascroll.el")

(global-yascroll-bar-mode 1)
(setq-default yascroll:delay-to-hide nil)

[dears1rr]

I have the same problem as @FuzzyWuzzyBMP, the update made some major modes very slow, like efleed or mingus (mpd controller). I had to remove (setq-default yascroll:delay-to-hide nil) to make it work again.

[philc]

Setting yascroll:delay-to-hide to nil makes building the buffer shown by magit-log-mode slow. I don't need yascroll in magit buffers, so this solved it for me: (setq yascroll:disabled-modes '(magit-log-mode))