From 4ec7265991e6ff53893801b8724f224a3b5e1b15 Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@qt.io>
Date: Fri, 18 Feb 2022 18:13:08 +0100
Subject: [PATCH] QStringConverter: make name matching locale-independent
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The existing name lookup code used C's toupper() function for
case-insensitive comparison. However, that function's result depends
on the current locale.

Since the matcher is supposed to match the likes of "iso-8859-1" and
"latin-1", matching may fail in locales, such as Turkish, where
toupper(i) is İ (or i, if the former isn't representable in the current
charset), but toupper(I) remains I, causing a False Negative.

To fix, use the US-ASCII-only QtMiscUtils::toAsciiLower() function,
which has the added advantage that it's inline.

Pick-to: 6.3 6.2
Change-Id: I70613c0167d84e3dc3d282c61c716b5dd0b3e6bb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>