[Bug 193136] New: kmail composer performance decreases with long lines (wordwrap disabled)

[adam.hawthorne at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=193136

           Summary: kmail composer performance decreases with long lines
                    (wordwrap disabled)
           Product: kmail
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kdepim-bugs at kde.org
        ReportedBy: adam.hawthorne at gmail.com


Version:            (using KDE 4.2.2)
OS:                Linux
Installed from:    Ubuntu Packages

With the "wordwrap" option disabled, the composer window in kmail becomes
increasingly slow for long, unwrapped lines.  Although the logical line is
unwrapped, the composer window (correctly) wraps the physical lines rather than
using a horizontal scrollbar.  When the composer window shows a single logical
line wrapped over five or more physical lines, text entry becomes extremely
sluggish.  I can out-type the cursor by twenty characters or more, which makes
it difficult to edit an email with a reasonable length paragraph.

To test, simply turn off the "wordwrap" option in the composer, paste the above
paragraph into the composer window and begin typing (quickly, for best effect)
at the end of that line.

Some observations:

This does not appear to affect the entire window.  Short lines remain
relatively responsive to keyboard input.

This is unique to kmail, a text box on konqueror does not display the same
behavior.

Please let me know if I can provide more information.

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