2D: Add font pixelsize modification to qmltestbed


In order to test that the  font's pixelsize is correctly taken into
account in axis title placement.

Amends to 8451ba6d241d3c876869ca33b2a2b801c11a20f1

Pick-to: 6.12
Change-Id: I968fca5688deafb6b34aeb4a994ee2dfaf158d75
Reviewed-by: Tomi Korpipaa <tomi.korpipaa@qt.io>
commit46f8a339fe208f3b90abf2ea634aa2b491e00c4d
parent98fa85fc0ef60e6c5c6e347ff5f8a1849c1ac5c0
authorSami Varanka <sami.varanka@qt.io>
committerSami Varanka <sami.varanka@qt.io>
commit timeFri, 25 Sep 2026 07:18:30 +0000