TopSpin 'edhead' window tiny fonts bug

PROBLEM:
In TopSpin 3.2.7 (Centos 7) edhead window opens with unreadable tiny font. Other windows look normal. Window manager change doesn’t make a difference, the one on the screenshot is the KDE Plasma, window buttons are the same everywhere
Reinstallation of TopSpin did not help.

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SOLUTION:

Edit as superuser the file [TSHOME]/prog/tcl/libtix/init_lib.src and add the following lines at the end of the file:

if { [namespace exists tk ] }   {
font configure TkDefaultFont -size 12
font configure TkFixedFont -size 11
font configure TkTextFont -size 11
font configure TkMenuFont -size 11
font configure TkHeadingFont -size 14
font configure TkCaptionFont -size 10
font configure TkIconFont -size 8
font configure TkTooltipFont -size 10
}

Save the file and restart edhead

Source: x.com