FIX(client,Markdown): Do not prefix local file paths in references with "http"

Enables the use of references with file URIs by not prefixing the protocol "http" in either case where the reference value already starts with "http" or "file".

Author: GeneralUser01

src/mumble/Markdown.cpp

@@ -455,22 +455,22 @@ bool processMarkdownReferenceDefinition(Markdown::Items &items) {
 		QLatin1String("\n*\\h{,3}\\[([^\\]\n]+)\\]:\\h(?:<(.+?)>|([^\\h\n]+))"
 					  "(?:\\h(?:\"([^\"\n]+)\"|'([^'\n]+)'|\\(([^\\)\n]+)\\)))?(?:\\h*\n)*\\h*$"),
 		QRegularExpression::MultilineOption);
-	return regexMatchAndReplace(items, regex, "",
-								[&items](const QRegularExpressionMatch &match, const char *contentWrapper) {
-									QString reference = match.captured(1).toHtmlEscaped();
-									QString url       = findFirstMatchedGroup(match, 2, 3).toHtmlEscaped();
-									QString title     = findFirstMatchedGroup(match, 4, 6).toHtmlEscaped();
+	return regexMatchAndReplace(
+		items, regex, "", [&items](const QRegularExpressionMatch &match, const char *contentWrapper) {
+			QString reference = match.captured(1).toHtmlEscaped();
+			QString url       = findFirstMatchedGroup(match, 2, 3).toHtmlEscaped();
+			QString title     = findFirstMatchedGroup(match, 4, 6).toHtmlEscaped();
 
-									if (!url.startsWith("http", Qt::CaseInsensitive)) {
-										url.prepend("http://");
-									}
+			if (!url.startsWith("http", Qt::CaseInsensitive) && !url.startsWith("file", Qt::CaseInsensitive)) {
+				url.prepend("http://");
+			}
 
-									QHash< QString, std::tuple< QString, QString > > &references = items.references;
-									if (!references.contains(reference)) {
-										references[reference] = { unescapeURL(url), title };
-									}
-									return QLatin1String(contentWrapper);
-								});
+			QHash< QString, std::tuple< QString, QString > > &references = items.references;
+			if (!references.contains(reference)) {
+				references[reference] = { unescapeURL(url), title };
+			}
+			return QLatin1String(contentWrapper);
+		});
 }
 
 /// Tries to find and insert queued Markdown references, replacing each placeholder and name