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QTBUG-89599, QTBUG-91735: Fix by reverting

Andreas Sturmlechner requested to merge asturmlechner/qtbase:QTBUG-89599-QTBUG-91735-reverts into kde/5.15 
Revert "QPushButton: fix support of style sheet rule for text alignment"

This reverts commit 6269438af95bbd988ead08829fa3bc9dc25891e8, and adds a test.

This change introduced QTBUG-91735, without fixing QTBUG-86857 correctly. The
code already interprets the textAlignment values from the rule, also if no
icon is set. Adding the same, or some default textAlignment to the text flags
if there is no icon doesn't work.

Fixes: QTBUG-91735
Task-number: QTBUG-86857
Pick-to: 6.1 6.0 5.15
Change-Id: Iee07e63a40e72909275f32e1caa28b33a595f879
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit 674747bac1c8b57d4940de2ee68b6b562dfcad61)
Revert "Fix invalid text layout data when a full layout run is interrupted"

This reverts commit 09ee4282e5eedf5b44245e8b28b223339f87ddfa.
The commit made the layouting time go from linear to quadratic, which is
problematic when rendering big documents impractical.

I wrote an alternative fix for QTBUG-20354 which will come as separate
change since it approaches the problem in a different way.

Fixes: QTBUG-89599
Task-number: QTBUG-20354
Pick-to: 5.15
Pick-to: 6.0
Change-Id: Ie450332f06ee40e60c8e4c6c7d10834bff1acf74
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
(cherry picked from commit a62fa9b7cc520f3548356182bf5d6642c05be204)

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