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http://bugs.kde.org/show_bug.cgi?id=61933     
           Summary: [PATCH] Reduce flicker when selecting largish areas
           Product: kiconedit
           Version: unspecified
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: tanghus@kde.org
        ReportedBy: bvh-cplusplus@irule.be


Version:            (using KDE KDE 3.1.2)
Installed from:    Gentoo Packages

This patch reduces flicker and speeds up drawing in case a large area is selected. It uses two techniques

1. calls update() instead of repaint() so that Qt can schedule repaints more efficiently
2. paints to a pixmap that is bitblitted to the screen instead of drawing directly on the widget thereby eliminating flicker.

Please test this patch before committing, the paint code of kiconedit is not trivial and I am not 100% sure I got everything correct although it-works-for-me (tm).