Re: Suggestion: A fringe indicator that shows the last/first line before scrolling

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

David De La Harpe Golden wrote:
>>  I wanted to hide the
>>  fringe marks conditionally while they align with the real window-start
>>  and window-end (they're not useful then),
> 
> Huh. Of course, what's an apparently viable workaround?  Another idle
> timer! Yay!
> 
> Version 2 attached - made it a global minor mode.
> 
> Probably lots of issues, most major apart from previous mail's
> "am I using fringes and overlays right" question:
> 
> really should use separate overlay for each window (maybe weak hash
> table needed, or is there a way to hang things off windows I've
> missed?), right now, only shows in current window, which is a pity
> because it'd probably be particularly nice for scroll-other-window
> situations.

(overlay-put overlay 'window the-window)

> nongui terminals and gui terminals without fringes, could use
> alternate highlighting strategies I guess.
> 
> If you scroll fast, then what's fringe marked is of course not the
> immediately preceding window position, but the one from when emacs was
> last idle.  This is both desirable and undesirable, depending on
> whether you consider a series of consecutive scroll commands as one
> overall scroll operation or separate scroll operations, so not sure if
> should be fixed, maybe a post-command-hook could be used so that
> depending on user prefs, page-scrolling could fringe mark anew each
> time while scroll-bar-scrolling only after the lag, or whatever makes
> sense.

If you press page-down several times the mark disappears.