QtCore: fix a few more char/int/uint -> QChar conversions

They were masked by all QChar ctors being made explicit, except the
char16_t one, which was left as the only viable choice.

Change-Id: I5632795f3c7dd1de3830285d5446d9b994613466
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/mimetypes/qmimeprovider.cpp

@@ -281,7 +281,7 @@ bool QMimeBinaryProvider::matchSuffixTree(QMimeGlobMatchResult &result, QMimeBin
     while (min <= max) {
         const int mid = (min + max) / 2;
         const int off = firstOffset + 12 * mid;
-        const QChar ch = cacheFile->getUint32(off);
+        const QChar ch = char16_t(cacheFile->getUint32(off));
         if (ch < fileChar)
             min = mid + 1;
         else if (ch > fileChar)

src/corelib/serialization/qcbordiagnostic.cpp

@@ -112,7 +112,7 @@ static QString makeFpString(double d)
             s.prepend(QLatin1Char('-'));
     } else {
         s = QString::number(d, 'g', QLocale::FloatingPointShortest);
-        if (!s.contains(QLatin1Char('.')) && !s.contains('e'))
+        if (!s.contains(u'.') && !s.contains(u'e'))
             s += QLatin1Char('.');
     }
     return s;
@@ -171,14 +171,17 @@ void DiagnosticNotation::appendString(const QString &s)
             buf[1] = QChar(uc);
 
         if (buf[1] == QChar::Null) {
-            using QtMiscUtils::toHexUpper;
+            const auto toHexUpper = [](char32_t value) -> QChar {
+                // QtMiscUtils::toHexUpper() returns char, we need QChar, so wrap
+                return char16_t(QtMiscUtils::toHexUpper(value));
+            };
             if (ptr->isHighSurrogate() && (ptr + 1) != end && ptr[1].isLowSurrogate()) {
                 // properly-paired surrogates
                 ++ptr;
                 char32_t ucs4 = QChar::surrogateToUcs4(uc, ptr->unicode());
-                buf[1] = 'U';
-                buf[2] = '0'; // toHexUpper(ucs4 >> 28);
-                buf[3] = '0'; // toHexUpper(ucs4 >> 24);
+                buf[1] = u'U';
+                buf[2] = u'0'; // toHexUpper(ucs4 >> 28);
+                buf[3] = u'0'; // toHexUpper(ucs4 >> 24);
                 buf[4] = toHexUpper(ucs4 >> 20);
                 buf[5] = toHexUpper(ucs4 >> 16);
                 buf[6] = toHexUpper(ucs4 >> 12);
@@ -187,7 +190,7 @@ void DiagnosticNotation::appendString(const QString &s)
                 buf[9] = toHexUpper(ucs4);
                 buflen = 10;
             } else {
-                buf[1] = 'u';
+                buf[1] = u'u';
                 buf[2] = toHexUpper(uc >> 12);
                 buf[3] = toHexUpper(uc >> 8);
                 buf[4] = toHexUpper(uc >> 4);

src/corelib/time/qdatetimeparser.cpp

@@ -1663,9 +1663,9 @@ QDateTimeParser::findTimeZone(QStringRef str, const QDateTime &when,
 
         // Collect up plausibly-valid characters; let QTimeZone work out what's truly valid.
         while (index < size) {
-            QChar here = str[index];
+            const auto here = str[index].unicode();
             if (here < 127
-                && (here.isLetterOrNumber()
+                && (QChar::isLetterOrNumber(here)
                     || here == '/' || here == '-'
                     || here == '_' || here == '.'
                     || here == '+' || here == ':'))

src/corelib/time/qtimezoneprivate_tz.cpp

@@ -91,7 +91,7 @@ static QTzTimeZoneHash loadTzTimeZones()
     while (!ts.atEnd()) {
         const QString line = ts.readLine();
         // Comment lines are prefixed with a #
-        if (!line.isEmpty() && line.at(0) != '#') {
+        if (!line.isEmpty() && line.at(0) != u'#') {
             // Data rows are tab-separated columns Region, Coordinates, ID, Optional Comments
             const auto parts = line.splitRef(QLatin1Char('\t'));
             QTzTimeZone zone;