Widgets are not shown gray when disabled

Starting with Qt 6.5, QLabel is not displayed with gray text when disabled. This behavior also appears with Qt 6.6.0 and presumably all versions in between.

At first I thought it was a Wayland-related problem, but this is not the case since it also happens when I log in with Xorg. As reported by JoeCFD, a user of Lubuntu, this doesn't happen there (see forum thread in link posted below).

Please refer to the [thread on the Qt forum|https://forum.qt.io/topic/151240/qt6-platform-rendering-issues-on-ubuntu-22-04] for details ... user JoeCFD has contributed a small desktop application which illustrates the problem.