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bug#10578: 24.0.92; No png images on OpenSUSE 12.1

From: Eli Zaretskii
Subject: bug#10578: 24.0.92; No png images on OpenSUSE 12.1
Date: Sun, 22 Jan 2012 20:12:34 +0200

> Date: Sun, 22 Jan 2012 19:51:40 +0200
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden
> > 1) Why didn't the warnings appear in the echo area instead of just
> > hiding out in the *Messages* buffer?
> Most probably because they are emitted during redisplay, and you
> cannot have anything displayed in the echo area at redisplay time,
> because doing so re-enters redisplay, which will again produce the
> same error message, etc., ad nauseam (a.k.a. infloop).

The message is logged by image_error that has this commentary:

  /* Log error message with format string FORMAT and argument ARG.
     Signaling an error, e.g. when an image cannot be loaded, is not a
     good idea because this would interrupt redisplay, and the error
     message display would lead to another redisplay.  This function
     therefore simply displays a message.  */

(That last "displays" should be "logs".)

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