[Konsole-devel] [Bug 125929] New: Changing konsole font size produces inconsistent sizes after xrandr resolution switch

[Jukka Laurila]

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http://bugs.kde.org/show_bug.cgi?id=125929         
           Summary: Changing konsole font size produces inconsistent sizes
                    after xrandr resolution switch
           Product: konsole
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel kde org
        ReportedBy: jplauril cc hut fi


Version:            (using KDE KDE 3.5.2)
Installed from:    Ubuntu Packages
OS:                Linux

To reproduce:

- start konsole
- set X to a low resolution mode using xrandr
- press ctrl-+ to enlarge the font
- press ctrl-- to reduce the font
- set X to a high resolution mode using xrandr
- press ctrl-+ to enlarge the font again

Expected result from last step: font gets bigger.
Actual result: font gets smaller.

Speculation: It seems like when a given font size is needed for the first time, konsole renders it into some cache based on the then-current DPI value of the screen. This cache is then not properly invalidated after the display resolution and DPI is changed with xrandr, and thus the font konsole gets from the cache is of the wrong size after the resolution change. Restarting konsole seems to clear this cache, and font resizing works as it should as long as the resolution stays the same.