Fix index bug when loading xcursor image #1138
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Whilst working on the LXQt-Slint integration I found this bug. This can cause a crash and prevents the theme preview icon (sample) to be shown (see
XCursorThemeData::icon()). The correct byte size for a 32 bit ARGB pixel is 4 bytes (instead of 1 byte). It possibly needs further work to display the xcursor theme icon in LXQt again. Had a lot of fun debugging this. 😸