[Konsole-devel] [Bug 116087] New: Garbage stays on screen with antialiasing enabled

[sarbalap-bugskde at yahoo.es]

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http://bugs.kde.org/show_bug.cgi?id=116087         
           Summary: Garbage stays on screen with antialiasing enabled
           Product: konsole
           Version: 1.5.2
          Platform: Slackware Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel kde org
        ReportedBy: sarbalap-bugskde yahoo es


Version:           1.5.2 (using KDE KDE 3.4.2)
Installed from:    Slackware Packages
OS:                Linux

I have antialiasing enabled, but hinting disabled. With a 75dpi X server and the font "Bitstream Vera Sans Mono" in size 16, underscore characters showed in konsole leave garbage after you delete or overwrite them. An easy way of testing this is, whith the above antialiasing settings, type several underscores in the prompt, then delete them. You'll see some small grey lines remaining.

The bug does not happen when you change the antialiasing type to include hinting. The bug does not happen in other KDE applications that I know of. For example, I use the same monospace font in kedit, and it does not have that problem. I have tried using a smaller font, changing the size from 16 to 14, and the problem disappears too. It is just that that font, size and antialiasing settings are the ones I prefer, and I hit the bug with them :(.

I will provide some screenshots to show the problem. I have also noticed that when you type only an underscore alone, the line is lighter. The line is darker if you type another underscore to the right (why?).