[kmail2] [Bug 377714] New: Long plaintext message with deep quotation does not display

[Krzysztof Nowicki]

https://bugs.kde.org/show_bug.cgi?id=377714

            Bug ID: 377714
           Summary: Long plaintext message with deep quotation does not
                    display
           Product: kmail2
           Version: 5.4.1
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: krissn at op.pl
  Target Milestone: ---

Created attachment 104606
  --> https://bugs.kde.org/attachment.cgi?id=104606&action=edit
Example message

I've been included in a lengthy e-mail thread and at some point after receiving
yet another mail in it I have noticed that KMail couldn't display it any more
(and any of the subsequent messages in that thread). When walking the e-mail
list clicking on one of the later messages would cause the message pane to
still display the previous message. When double-clicking the e-mail I'm seeing
blank content. The message loaded correctly as I'm able to view its source and
I'm able to see the contents when starting a reply.

I have noticed that the message displays correctly when I enable the "Show
expand/collapse quote marks" and leave auto-collapse at level 3. If I keep
increasing the auto-collapse level I will eventually find one at which the
message does not display again.

When the message does display (with auto-collapse enabled) I am unable to
expand the collapsed quotation.

I have prepared a synthetic message which reproduces the problem (attached).

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