diff --git a/addons/tabswitcher/autotests/tabswitchertest.h b/addons/tabswitcher/autotests/tabswitchertest.h
--- a/addons/tabswitcher/autotests/tabswitchertest.h
+++ b/addons/tabswitcher/autotests/tabswitchertest.h
@@ -32,5 +32,6 @@
 
 private Q_SLOTS:
     void testLongestCommonPrefix();
+    void testLongestCommonPrefix_data();
 };
 
diff --git a/addons/tabswitcher/autotests/tabswitchertest.cpp b/addons/tabswitcher/autotests/tabswitchertest.cpp
--- a/addons/tabswitcher/autotests/tabswitchertest.cpp
+++ b/addons/tabswitcher/autotests/tabswitchertest.cpp
@@ -35,30 +35,43 @@
 
 void KateTabSwitcherTest::testLongestCommonPrefix()
 {
-    // standard case
+    QFETCH(std::vector<QString>, input_strings);
+    QFETCH(QString, expected);
+
+    QCOMPARE(detail::longestCommonPrefix(input_strings), expected);
+}
+
+void KateTabSwitcherTest::testLongestCommonPrefix_data()
+{
+    QTest::addColumn<std::vector<QString>>("input_strings");
+    QTest::addColumn<QString>("expected");
     std::vector<QString> strs;
+
+    strs.clear();
     strs.push_back(QLatin1String("/home/user1/a"));
     strs.push_back(QLatin1String("/home/user1/bc"));
-    QCOMPARE(detail::longestCommonPrefix(strs), QLatin1String("/home/user1/"));
+    QTest::newRow("standard case") << strs << QString(QLatin1String("/home/user1/"));
 
-    // empty string at the end of the list
     strs.clear();
     strs.push_back(QLatin1String("/home/a"));
     strs.push_back(QLatin1String("/home/b"));
     strs.push_back(QLatin1String(""));
-    QCOMPARE(detail::longestCommonPrefix(strs), QLatin1String(""));
+    QTest::newRow("empty string at the end of the list") << strs << QString();
 
-    // empty string not only at the end of the list
     strs.clear();
     strs.push_back(QLatin1String(""));
     strs.push_back(QLatin1String("/home/a"));
     strs.push_back(QLatin1String("/home/b"));
     strs.push_back(QLatin1String(""));
-    QCOMPARE(detail::longestCommonPrefix(strs), QLatin1String(""));
+    QTest::newRow("empty string not only at the end of the list") << strs << QString();
 
-    // a prefix with length 1
     strs.clear();
     strs.push_back(QLatin1String("/home/a"));
     strs.push_back(QLatin1String("/etc/b"));
-    QCOMPARE(detail::longestCommonPrefix(strs), QLatin1String("/"));
+    QTest::newRow("a prefix with length 1") << strs << QString(QLatin1String("/"));
+
+    strs.clear();
+    strs.push_back(QLatin1String("a"));
+    strs.push_back(QLatin1String("a"));
+    QTest::newRow("two equal strings") << strs << QString(QLatin1String("a"));
 }
diff --git a/addons/tabswitcher/tabswitcherfilesmodel.h b/addons/tabswitcher/tabswitcherfilesmodel.h
--- a/addons/tabswitcher/tabswitcherfilesmodel.h
+++ b/addons/tabswitcher/tabswitcherfilesmodel.h
@@ -80,6 +80,6 @@
     FilenameList data_;
 };
 
-QString longestCommonPrefix(std::vector<QString>& strs);
+QString longestCommonPrefix(std::vector<QString> const & strs);
 
 }
diff --git a/addons/tabswitcher/tabswitcherfilesmodel.cpp b/addons/tabswitcher/tabswitcherfilesmodel.cpp
--- a/addons/tabswitcher/tabswitcherfilesmodel.cpp
+++ b/addons/tabswitcher/tabswitcherfilesmodel.cpp
@@ -30,7 +30,7 @@
      * see also http://www.cplusplus.com/forum/beginner/83540/
      * Note that if strs contains the empty string, the result will be ""
      */
-    QString longestCommonPrefix(std::vector<QString>& strs) {
+    QString longestCommonPrefix(std::vector<QString> const & strs) {
         int n = INT_MAX;
         if (strs.size() <= 0) {
             return QString();
diff --git a/kate/katequickopen.cpp b/kate/katequickopen.cpp
--- a/kate/katequickopen.cpp
+++ b/kate/katequickopen.cpp
@@ -163,6 +163,20 @@
      */
     const QList<KTextEditor::View *> sortedViews(m_mainWindow->viewManager()->sortedViews());
 
+    auto prettyDocumentUrl = [](const QUrl & url) {
+        if (!url.isEmpty() && url.isLocalFile()) {
+            return url.toLocalFile();
+        } else {
+            return url.toString();
+        }
+    };
+
+    auto addToAlreadySeen = [&alreadySeenFiles](KTextEditor::Document *doc) {
+        if (!doc->url().isEmpty() && doc->url().isLocalFile()) {
+            alreadySeenFiles.insert(doc->url().toLocalFile());
+        }
+    };
+
     /**
      * now insert them in order
      */
@@ -187,15 +201,13 @@
         font.setBold(true);
         itemName->setFont(font);
 
-        QStandardItem *itemUrl = new QStandardItem(doc->url().toString());
+        QStandardItem *itemUrl = new QStandardItem(prettyDocumentUrl(doc->url()));
         itemUrl->setEditable(false);
         m_base_model->setItem(linecount, 0, itemName);
         m_base_model->setItem(linecount, 1, itemUrl);
         linecount++;
 
-        if (!doc->url().isEmpty() && doc->url().isLocalFile()) {
-            alreadySeenFiles.insert(doc->url().toLocalFile());
-        }
+        addToAlreadySeen(doc);
 
         // select second document, that is the last used (beside the active one)
         if (linecount == 2) {
@@ -215,7 +227,6 @@
             continue;
         }
 
-        //QStandardItem *item=new QStandardItem(i18n("%1: %2",doc->documentName(),doc->url().toString()));
         QStandardItem *itemName = new QStandardItem(doc->documentName());
 
         itemName->setData(qVariantFromValue(QPointer<KTextEditor::Document> (doc)), DocumentRole);
@@ -225,15 +236,13 @@
         font.setBold(true);
         itemName->setFont(font);
 
-        QStandardItem *itemUrl = new QStandardItem(doc->url().toString());
+        QStandardItem *itemUrl = new QStandardItem(prettyDocumentUrl(doc->url()));
         itemUrl->setEditable(false);
         m_base_model->setItem(linecount, 0, itemName);
         m_base_model->setItem(linecount, 1, itemUrl);
         linecount++;
 
-        if (!doc->url().isEmpty() && doc->url().isLocalFile()) {
-            alreadySeenFiles.insert(doc->url().toLocalFile());
-        }
+        addToAlreadySeen(doc);
     }
 
     /**