Port qt_repeatCount() to qsizetype

While it's true that the typical user of the function won't expect
more than half a dozen repeats, this function is fed with
user-supplied input, so it could be asked to return in excess of
INT_MAX matches. The truncation then means we're misreporting the
number mod INT_MAX, which is as good as a random number and leads to
false positive matches in users of the function.

Just return the true result instead of a truncated one.

Pick-to: 6.4 6.3 6.2
Task-number: QTBUG-103531
Change-Id: I5e3aa23dec873c6f9af255e90748fb38619d2f5d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/corelib/text/qlocale.cpp

@@ -668,7 +668,7 @@ QString qt_readEscapedFormatString(QStringView format, int *idx)
     qt_repeatCount(u"aab"); // == 2
     \endcode
 */
-int qt_repeatCount(QStringView s)
+qsizetype qt_repeatCount(QStringView s)
 {
     if (s.isEmpty())
         return 0;
@@ -676,7 +676,7 @@ int qt_repeatCount(QStringView s)
     qsizetype j = 1;
     while (j < s.size() && s.at(j) == c)
         ++j;
-    return int(j);
+    return j;
 }
 
 Q_CONSTINIT static const QLocaleData *default_data = nullptr;
@@ -3333,7 +3333,7 @@ QString QCalendarBackend::dateTimeToString(QStringView format, const QDateTime &
         }
 
         const QChar c = format.at(i);
-        int repeat = qt_repeatCount(format.mid(i));
+        qsizetype repeat = qt_repeatCount(format.mid(i));
         bool used = false;
         if (formatDate) {
             switch (c.unicode()) {

src/corelib/text/qlocale_mac.mm

@@ -267,7 +267,7 @@ static QVariant macToQtFormat(QStringView sys_fmt)
         }
 
         QChar c = sys_fmt.at(i);
-        int repeat = qt_repeatCount(sys_fmt.mid(i));
+        qsizetype repeat = qt_repeatCount(sys_fmt.mid(i));
 
         switch (c.unicode()) {
             // Qt does not support the following options

src/corelib/text/qlocale_p.h

@@ -479,7 +479,7 @@ inline char QLocaleData::numericToCLocale(QStringView in) const
 QString qt_readEscapedFormatString(QStringView format, int *idx);
 [[nodiscard]] bool qt_splitLocaleName(QStringView name, QStringView *lang = nullptr,
                                       QStringView *script = nullptr, QStringView *cntry = nullptr);
-[[nodiscard]] int qt_repeatCount(QStringView s);
+[[nodiscard]] qsizetype qt_repeatCount(QStringView s);
 
 enum { AsciiSpaceMask = (1u << (' ' - 1)) |
                         (1u << ('\t' - 1)) |   // 9: HT - horizontal tab

src/corelib/text/qlocale_win.cpp

@@ -729,7 +729,7 @@ QString QSystemLocalePrivate::winToQtFormat(QStringView sys_fmt)
         }
 
         QChar c = sys_fmt.at(i);
-        int repeat = qt_repeatCount(sys_fmt.mid(i));
+        qsizetype repeat = qt_repeatCount(sys_fmt.mid(i));
 
         switch (c.unicode()) {
             // Date