Correctly locate files with relative paths

QUrl("relativefilename").toLocalFile() changed behavior
and now returns an empty string if the scheme is not set.
Setting the scheme to "file:" in setSource would however
break some other assumptions in the code about relative
url's.

Task-number: QTBUG-22416
Change-Id: I1b3fcbef81f6e356935ec426903989e783ce9a78
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/widgets/widgets/qtextbrowser.cpp

@@ -153,6 +153,8 @@ QString QTextBrowserPrivate::findFile(const QUrl &name) const
     QString fileName;
     if (name.scheme() == QLatin1String("qrc"))
         fileName = QLatin1String(":/") + name.path();
+    else if (name.scheme().isEmpty())
+        fileName = name.path();
     else
         fileName = name.toLocalFile();
 

tests/auto/widgets/widgets/qtextbrowser/tst_qtextbrowser.cpp

@@ -250,8 +250,6 @@ void tst_QTextBrowser::viewportPositionInHistory()
 
 void tst_QTextBrowser::relativeLinks()
 {
-    QEXPECT_FAIL("", "QTBUG-22416: First call to QTextBrowser::setSource fails unless URL created with QUrl::fromLocalFile", Abort);
-
     qRegisterMetaType<QUrl>("QUrl");
     QSignalSpy sourceChangedSpy(browser, SIGNAL(sourceChanged(const QUrl &)));
     browser->setSource(QUrl("subdir/../qtextbrowser.html"));