[Tabbar] Show tooltips for untitled documents

It also makes sense to show tooltips for untitled documents, since the text on shrunken tabs isn't always readable.

apps/lib/katetabbar.cpp

@@ -295,7 +295,7 @@ void KateTabBar::setTabDocument(int idx, KTextEditor::Document *doc)
     QString tabName = doc->documentName();
     tabName.replace(QLatin1Char('&'), QLatin1String("&&"));
     setTabText(idx, tabName);
-    setTabToolTip(idx, doc->url().toDisplayString());
+    setTabToolTip(idx, doc->url().isValid() ? doc->url().toDisplayString(QUrl::PreferLocalFile) : doc->documentName());
     setModifiedStateIcon(idx, doc);
 }
 

apps/lib/kateviewspace.cpp

@@ -697,7 +697,7 @@ void KateViewSpace::updateDocumentUrl(KTextEditor::Document *doc)
     // update tab button if available, might not be the case for tab limit set!
     const int buttonId = m_tabBar->documentIdx(doc);
     if (buttonId >= 0) {
-        m_tabBar->setTabToolTip(buttonId, doc->url().toDisplayString());
+        m_tabBar->setTabToolTip(buttonId, doc->url().toDisplayString(QUrl::PreferLocalFile));
         m_tabBar->setModifiedStateIcon(buttonId, doc);
     }
 }