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

[Attila]

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

--- Comment #41 from Attila <bugs.kde.attila at online.de> ---
(In reply to RJVB from comment #39)
> A pure text email of 35Mb is massive too, but eating around 4Gb of RAM for
> that isn't just massive. That's what you meant, right, not 4Mb for
> displaying just the part that fits in your window (which would seem
> reasonable)? 4Gb, that's about 120 times the size of the email.

Yes I mean 4.317.684 K (QtWebEngineProcess).

> I knew KMail would become a powerkids' tool with the design decision to use
> a full-fledged-browser-in-a-widget (QtWebEngine) for rendering everything
> including pure text emails but I wasn't expecting this. Then again, I don't
> usually get this kind of long letters by email so I have no idea how any
> other MUA would handle them.

I get this kind of long emails every day. This is the output from backup
scripts executed by Cron.

> If the account you got this email on has a web/browser interface it would be
> interesting to estimate the resources an actual browser (GChrome or
> Chromium) would use to display it, for comparison.

Unfortunately this account doesn't have a Web-Interface, but I did a test on
another account with Web-Interface.
The plain text has a size of 20 MiB.

In Comparison:
QtWebEngineProcess (KMail) is eating 1.609.232 K.
Firefox (Web-Interface) is eating 156.204 K.

Firefox can display this e-mail within 2 seconds and I can scroll very smooth
through  the content by dragging the scrollbar.

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