GNU bug report logs - #30182
27.0.50; Crash when doing mouse-over on modeline

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Message #104 received at 30182 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: m.sujith <at> gmail.com, 30182 <at> debbugs.gnu.org
Subject: Re: bug#30182: Update
Date: Wed, 24 Jan 2018 21:05:48 +0100

>>   > So if using a string instead of a function the returns a string solves
>>   > the problem, then I guess we should try and understand why a function
>>   > causes the problem.
>>
>> Apparently because evaluating that function creates a timer.
>
> You mean, mode-line-default-help-echo creates a timer?  If it does, I
> don't see where it does that.

Sorry.  I meant `w3m-modeline-title' creates a timer when trying to
shorten the title.  In order to do that it has to run
`format-mode-line' first which calls `mode-line-default-help-echo'.

> What I don't understand is how is the above :eval form related to
> mode-line-default-help-echo.  They are both properties of parts of the
> mode line, but how is that relevant to the issue at hand?

Because if it's not done, the crash doesn't happen according to the
OP:

  If I change the default value of w3m-use-title-buffer-name and
  set it to non-nil, then the crash doesn't seem to happen.

martin

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