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bug#34138: 27.0.50; Delayed display of PDF file images

From: martin rudalics
Subject: bug#34138: 27.0.50; Delayed display of PDF file images
Date: Sun, 20 Jan 2019 15:19:56 +0100

> I can reproduce this: Opening a PDF in the latest Emacs version requires
> an extra redisplay for the image to appear, e.g. by entering the
> minibuffer.

Do you have any idea what might be causing it?  Excluding
'display-buffer-split-below-and-attach' it should be related to

>> 'display-buffer-split-below-and-attach' calls 'window--display-buffer'
>> with a fifth argument and that has been changed in another commit.
> I really wish this function would be part of the public API. Or else,
> what is the best way to implement a function like
> display-buffer-mark-dedicated ?

It will be public soon.  Moreove, application will not have to bother
with ‘display-buffer-mark-dedicated’ any more.

>>> In addition, in pdf-view-mode this appears in *Message*:
>>> Error during redisplay: (eval (pdf-misc-size-indication)) signaled
>>> (error "Invalid image specification: nil").
>> This should come from the 'image-display-size' call in
>> 'pdf-view-image-size'.  Could you get a backtrace for it?
> Right, the function pdf-misc-size-indication assumes the existence of a
> displayed image in the selected window.

What happened here?  Did the image not get displayed or did the
selected window change or get another buffer?


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