Re: Framework extending window functions for Follow Mode (etc.).

[Alan Mackenzie]

Hello, Martin.

On Sat, Nov 07, 2015 at 02:26:16PM +0100, martin rudalics wrote:
>  > The six functions window-start, window-end, set-window-start, recenter,
>  > pos-visible-in-window-p, and move-to-window-line-function will acquire
>  > an extra optional parameter GROUP.  The notion is that "this call is
>  > interested in groups of windows, not just single ones".

>  > Each of these functions will get an associated variable, e.g.
>  > "window-start-function".  The function will call the value of that
>  > variable instead of doing its normal actions, when GROUP is non-nil.
>  > Typically, the `window-start-function' will recursively call
>  > window-start (on some window) to perform its operation.

> Instead of an extra argument I would prefer to have these functions
> check for the presence of a ‘window-start’, ‘window-end’, ... window
> parameter just like ‘delete-window’ or ‘other-window’ do.

I don't think that would be the Right Thing (if I've understood it
properly, that is).  With Follow Mode active, which window start
window-start returns is primarily about the context of the window-start
invocation; it's not about some windows always doing one thing, some
always doing another.

> martin

-- 
Alan Mackenzie (Nuremberg, Germany).