Bug#236806: Yes I think DisplaySize is the right solution
The Problem is, if you upgrade from an previous installation and the
"-dpi" Option was set before and DisplaySize was not set . Than you
search for a long time to find out, why your fonts are so small now.
This is even worse as you remember that you only upgraded KDE and not X.
So probably XF86Config-4 should be scanned for this value and a warning
message should be displayed.
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