a11y: Ensure std::memcmp works by adding member for unused State bits

Due to padding, std::memcmp wasn't guaranteed to return 0
even if all (bit)fields of the two QAccessible::State
structs were identical.

This was e.g. causing various of the state-related tests
in tst_qaccessibility to fail in a Clang 21 build on Debian
testing.

Prevent randomness in the padding bits by making them explicit
using an explicit `qt_reserved` member.

All bits are already initialized to 0 in the ctor and
now updating another field can no longer result in random
values being written to the previously unreserved bits.

Fixes: QTBUG-142463
Pick-to: 6.11 6.10 6.8 6.5
Change-Id: Id62866a688d8e8dd13143961b1a22f36cac09caa
Reviewed-by: Volker Hilsheimer <[email protected]>

0 files changed, 0 insertions, 0 deletions