Gracefully reject requests for absurd font sizes

Albert Astals Cidrequested to merge
aacid/qtbase:work/absurd_font_size into kde/5.15

Avoid overflows.

Fixes: QTBUG-89899

Pick-to: 6.0 5.15 5.12

Change-Id: Ic1a83c1704fe20be3d032358dc91ee8e751f2281

Reviewed-by: Eskil Abrahamsen Blomfeldt eskil.abrahamsen-blomfeldt@qt.io

(cherry picked from commit 67975068)

Edited by Albert Astals Cid

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