[kmail2] [Bug 400831] New: The tooltip of message preview layout doesn't look right

[younker.dl at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=400831

            Bug ID: 400831
           Summary: The tooltip of message preview layout doesn't look
                    right
           Product: kmail2
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: younky.yang at yahoo.com
  Target Milestone: ---

Created attachment 116174
  --> https://bugs.kde.org/attachment.cgi?id=116174&action=edit
the wrong layout of the tooltip

SUMMARY
The message preview tooltip's layout doesn't look right when using chinese on a
4K display. 

STEPS TO REPRODUCE
1. setting the language to Chinese. Maybe Japanese has the same issue. 
2. Launch kmail
3. hover to a item in the message list and check the preview tooltip of the
message. 

OBSERVED RESULT
The layout is not right for From, Sender, etc. The text was wrapped. 

EXPECTED RESULT
the first column of the text should not be wrapped. 

SOFTWARE VERSIONS
(available in About System)
KDE Plasma Version: 5.14.x
KDE Frameworks Version: 5.51.x
Qt Version: 5.11.2

ADDITIONAL INFORMATION
I posted this to reddit
https://www.reddit.com/r/kde/comments/9uxumy/where_is_the_source_code_for_the_kmail_message/?utm_content=full_comments&utm_medium=message&utm_source=reddit&utm_name=frontpage
and I followed the guidance provided KeyRice to change the code in
messagelib/messagelist/src/core/view.cpp. changed the hard coded width setting
from 45 to 85, and it now looks good on my display. 
But I think this not the solution for this problem, we need to have a method to
determine the right width based on the display(dpi) and also the scale factor.

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