FuzzyMatcher: Handle digits as camel hump

Allow searching for "Fancy4PartThingy" with the
more intuitive pattern "f4pt" as well as with the
pattern "fpt" that already worked before.

Fixes: QTCREATORBUG-22671
Change-Id: I3a7c1a5b7f57d2f2bdd7d0c6e23b46f6bbb64d77
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/libs/utils/fuzzymatcher.cpp

@@ -75,7 +75,7 @@ QRegularExpression FuzzyMatcher::createRegExp(
     const QLatin1String upperSnakeWordContinuation("[A-Z0-9]*_");
     keyRegExp += "(?:";
     for (const QChar &c : pattern) {
-        if (!c.isLetter()) {
+        if (!c.isLetterOrNumber()) {
             if (c == question) {
                 keyRegExp += '.';
                 plainRegExp += ").(";