Re: 23.0.60; doc-view: occasionally stuck at welcome screen

[Stefan Monnier]

>> When I do M-x doc-view-clear-cache, and then:
>> 
>> $ emacs -Q file.pdf
>> 
>> doc-view correctly displays the file (for example, with:
>> http://www.logic.at/prolog/testqueens.pdf ). If I quit, and again
>> 
>> $ emacs -Q file.pdf
>> 
>> then doc-view is stuck at the welcome screen. (When I press "C-c" four
>> times, it displays the document.)

> I can reproduce that.  Hitting PageDown on the welcome screen is a
> woraround, too.

>> When I do M-x doc-view-clear-cache, I can again view the document with
>> "emacs -Q file.pdf", but it fails on every later attempt ("emacs
>> -Q..."), until I clear the cache again.

> I've located the source of the problem.  In doc-view-display the
>   (dolist (win (get-buffer-window-list buffer nil t)) ...)
> doesn't iterate over any windows, e.g. get-buffer-window-list returns nil.

Is it run before `buffer' is shown in a window, maybe?

> I don't know why.  Maybe the with-current-buffer form shadows the
> buffer-window association?

No, with-current-buffer (i.e. set-buffer) should never affect the output
of get-buffer-window-list.

> The caller is doc-view-initiate-display and the problem occurs when a
> doc is already converted and thus the cached png files are used.  Then
> the call is

>   (doc-view-display (current-buffer) 'force)

> Since the current buffer (which shows the welcome screen) in visible,
> get-buffer-window-list should return that window...

Hmmm....


        Stefan