[kmail2] [Bug 387061] REGRESSION: Large messages don't display in the viewer pane (eg. New Tumbleweed snapshot 20171117 released!)

[Wolfgang Bauer]

https://bugs.kde.org/show_bug.cgi?id=387061

--- Comment #44 from Wolfgang Bauer <wbauer at tmo.at> ---
(In reply to RJVB from comment #43)
> > TBH, I think even QtWebKit would struggle with these large mails
> 
> That would be simple to test in konqueror with the webkit backend, or
> Otter-Browser, and the rebooted QtWebKit. Or in epiphany.
> 1 caveat emptor: we don't actually know what clever tricks the web email
> interface pulls.
I do use QtWebKit with konqueror, and opening large OBS logs (which are just
text files) do take a while.

> > Anyway, this is kind of a different problem than comment#35 (or comment#0).
> > I don't see how it could be fixed from the kmail side, except for not trying
> > to display mails larger than a certain size at all. (or maybe just display
> > it as plain text instead then, but that probably means a large rewrite of
> > the code, and I'm not sure it's possible at all)
> 
> - Don't dump the entire message into the rendering widget but use a paged
> approach
> - wrapper code can be written that connects to different backends. If you
> don't want to support QtWebkit, fine, but there's also QTextBrowser which
> should be sufficient even for simple HTML emails (it's what Qt's assistant
> uses by default since whatever Qt version that obsoleted QtWebkit). I've
> done a compile-time version of such wrapper code for KDevelop's help browser
> (which supports both QWE and QWK). I think it should be possible at least to
> chose between backends as a startup option.
That's what I meant with a "large rewrite" amongst other things.
Please note that I'm not a kmail developer though.

> Out of curiosity: does that humongous QWE process exit when you close the
> message view, or do you have to quit KMail to recuperate all that RAM?
I think that the QWE process is reused.
I'm not sure though, nor if it frees the resources when you switch to a
different mail (I think it does).

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