URI: be more strict with www. URIs

We recognize URIs that start with an scheme and a possibly empty
authority, and URI suffixes that start with "www."

In the case of URIs starting with an scheme, they are of the form:

scheme://[ userinfo "@" ] host ...

while "www." URI suffixes are of the form:

www. <rest of host> ...

where host is actually in reg-name form (not in IPv4address or
IP-literal form).

This commit allows more strict parsing of e.g.

www.example.com:foo@bar.com

as <URI>:<email> instead of as a long <URI>.

src/autotests/HotSpotFilterTest.cpp

@@ -63,6 +63,9 @@ void HotSpotFilterTest::testUrlFilterRegex_data()
                                  << "http://example.com" << true;
     QTest::newRow("empty_fragment") << "http://example.com/#"
                                     << "http://example.com" << true;
+
+    QTest::newRow("www_followed_by_colon") << "www.example.com:foo@bar.com"
+                                           << "www.example.com" << true;
 }
 
 void HotSpotFilterTest::testUrlFilterRegex()

src/filterHotSpots/UrlFilter.cpp

@@ -37,7 +37,8 @@ using namespace Konsole;
 // scheme://
 // - Must start with an ASCII letter, preceeded by any non-word character,
 //   so "http" but not "mhttp"
-static const char scheme_or_www[] = "(?<=^|[\\s\\[\\]()'\"])(?:www\\.|[a-z][a-z0-9+\\-.]*+://)";
+static const char scheme_or_www[] = "(?<=^|[\\s\\[\\]()'\"])(?:www\\.|[a-z][a-z0-9+\\-.]*+://";
+static const char scheme_or_www_end[] = ")";
 
 // unreserved / pct-encoded / sub-delims
 #define COMMON_1 "a-z0-9\\-._~%!$&'()*+,;="
@@ -62,6 +63,7 @@ using LS1 = QLatin1String;
 const QRegularExpression UrlFilter::FullUrlRegExp(
     LS1(scheme_or_www)
     + LS1(userInfo)
+    + LS1(scheme_or_www_end)
     + LS1(host)
     + LS1(port)
     + LS1(path)