[kmail2] [Bug 398054] New: Attached HTML files are managed as "body part"

[gianogli]

https://bugs.kde.org/show_bug.cgi?id=398054

            Bug ID: 398054
           Summary: Attached HTML files are managed as "body part"
           Product: kmail2
           Version: 5.7.3
          Platform: Debian testing
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: gianogli at tiscali.it
  Target Milestone: ---

Created attachment 114694
  --> https://bugs.kde.org/attachment.cgi?id=114694&action=edit
Issue with a not too big HTML file

When I receive an e-mail with a big (> 4MB) HTML file attached, kmail take a
long time to show the preview of the message (in HTML format) because it
wrongly manage the attached file as a "body part".

With this kind of e-mail if I try to click on the "HTML side bar" to switch to
the "plain massage" format it doesn't works and remain in the "html message"
format.

I think that the problem is due to the way that kmail manages the HTML files
attached to an e-mail: kmail considers this files as a body part of the e-mail
and it tries to preview them instead of show only the file name at the end of
the body text (as it happens, in instance for a zip file).

There is a way to consider an HTML attached file as a normal file and then
disable its preview?
If not, could you change this behavior?

If I click on an e-mail with a very big HTML attachment kmail became
unresponsive for a long period: for this reason I set the severity of this bug
to "major". 

Thanks...

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