I have just upgraded to Fedora 31, and noticed some odd effects with
font sizes. With some investigation the cause seems to be that the
underlying font sizes can be a non-integer number of pixels; with a
'MonoSpace' example looking at gtk2widgetset.inc:5919:
TextMetric.tmAscent := pango_font_metrics_get_ascent(APangoMetrics) div
PANGO_SCALE;
evaluates as 11406/1024 = 11.129 which is truncated to 11
TextMetric.tmDescent := pango_font_metrics_get_descent(APangoMetrics)
div PANGO_SCALE;
evaluates as 2898/1024 = 2.83 which is truncated to 2.
The effective font height seems to be 2 pixels larger in this case, ot
at least that is what is required to fix previously working code. I
wonder if these calculations should be rounded up rather than down?
Colin
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