[Bug 251022] New: kompare: changing color in settings and applying that change only redraws middle piece (between before and after)

[esigra at gmail.com]

https://bugs.kde.org/show_bug.cgi?id=251022

           Summary: kompare: changing color in settings and applying that
                    change only redraws middle piece (between before and
                    after)
           Product: kompare
           Version: 4.0.0
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: viewpart
        AssignedTo: kompare-devel at kde.org
        ReportedBy: esigra at gmail.com


Created an attachment (id=51572)
 --> (http://bugs.kde.org/attachment.cgi?id=51572)
Screenshot after step 7.

Version:           4.0.0 (using KDE 4.5.1) 
OS:                Linux

When changing a color in the configuredialog and applying that change, only the
middle piece (between before and after) is redrawn.

Reproducible: Always

Steps to Reproduce:
1. Start Konsole.
2. Create a directory and cd into it.
3. Create the empty file empty.cc
4. Create the file prov.cc with some content like this:
float calculate_something(float const a, float const b, float const c) {
   return
      calculate_something(1.7, calculate_something(8.9, 19.51, 33.0), a) +
      calculate_something(c, 18.8, calculate_something(7.5, b, a));
}
5. Execute "diff -u empty.cc prov.cc|kompare -".
6. Open the settings dialog and change the background color of added blocks.
7. Press Apply.

Actual Results:  
Only the middle part is redrawn (see attached screenshot).

Expected Results:  
Also the before and after parts are redrawn.

The change does take effect if font is also changed before Apply is pressed, or
the configuredialog is closed (OK or Cancel).

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