Re: lru-window, window--try-to-split-window, split-width-threshold

[martin rudalics <rudalics@gmx.at>]

 > `split-width-threshold' was apparently introduced recently. Depending on its
 > value, the lru-window can now get split horizontally to display *Completions*
 > during minibuffer input.
 >
 > I have code that changes the display of completions (columns, spacing etc.),
 > depending on the width *Completions* will have when it is displayed. Before it
 > is displayed, I obtain (window-width (get-lru-window)) and use that as the
 > assumed window width.
 >
 > This is no longer adequate, however, because the effective width might be, say,
 > half of that if the lru window gets split horizontally to display *Completions*.
 > And I can't simply use half of that width systematically, because there might be
 > no horizontal split, depending on `split-width-threshold'. I don't know a way to
 > know ahead of time whether a horizontal split will occur (without reproducing
 > all of the code/logic of `window--try-to-split-window' - checking for dedicated
 > windows etc.).

So you can't fill the buffer _after_ the splitting occurred?  Relying on
someone else to always choose the LRU window is not very clean in the
first place.

 > I tried this: (window--try-to-split-window (get-lru-window)), figuring that I
 > might as  well split the lru-window myself, if it is going to be split, so that
 > I can get its new width and use that.
 >
 > The problem with this is that once the split occurs the window that was split is
 > apparently no longer the lru window, so *Completions* gets displayed by
 > splitting yet another window.

Are you sure?  The LRU status changes with `select-window' IIUC.

 > If I have two full-frame-width windows (frame
 > split vertically), the effect is that both windows get split when *Completions*
 > is displayed (and then unsplit when *Completions* is finished).
 >
 > Any suggestions? What am I missing? Is there some way, say, after splitting the
 > lru window myself, that I can make it (or the new one) the lru again, so that
 > `display-buffer' will use it for *Completions*? IOW, is there a way to *set* the
 > lru window? Any help is welcome.

The only way I currently can think of is a dolist selecting all other
windows but the one you've chosen.

martin