send preferred_buffer_scale event after entering an output #2331
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Qt 6.7.0+ requires this to correctly scale when fractional scale is not enabled.
A simple PyQt6 program to demostrate:
Setting
QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor
for Qt6 apps should also reproduce it but not tested. This happens with Telegram (with "presice High DPI scaling" disabled) + Qt6 6.7.0.Fixes #2253