The QLocal8Bit implementation assumes that there's at most one
continuation byte -- that is, that all codecs are either Single or
Double Byte Character Sets (SBCS or DBCS). It appears to be the case for
all Windows default codepages, except for CP_UTF8, which is an opt-in
anyway.
Instead of fixing our codec, let's just use the optimized UTF-8
implementation.
[ChangeLog][Windows] Fixed support for using Qt applications with UTF-8
as the system codepage or by enabling that in the application's
manifest.
Discussed-on: https://lists.qt-project.org/pipermail/interest/2022-May/038241.html
Pick-to: 6.2 6.3
Change-Id: I77c8221eb2824c369feffffd16f0912550a98049
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
9bad4be214