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It appears there are things called Qt StyleSheets that can be used to allow a user to override styles used for specific Widgets (such as QLineEdit widgets used in Find and Replace) which can include setting font sizes for some widgets.
I have never played with them but when I get a chance, I will try to find a tutorial via google about how users can set up and use their own Qt stylesheets passed into the app via the -style commandline option.
If this works, it may be help.
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