fix(kf5): open folder dialog before creating session

plasmoid/contents/ui/main-kf5.qml

@@ -25,6 +25,17 @@ Item {
         }
     }
 
+    FileDialog {
+        id: newSessionFolderDialog
+        title: "Choose working directory for new session"
+        selectFolder: true
+        folder: dbus.activeCwd ? "file://" + dbus.activeCwd : shortcuts.home
+        onAccepted: {
+            var path = fileUrl.toString().replace("file://", "")
+            dbus.createSession(path)
+        }
+    }
+
     Plasmoid.status: dbus.sessions.length > 0
         ? PlasmaCore.Types.ActiveStatus
         : PlasmaCore.Types.PassiveStatus
@@ -115,7 +126,7 @@ Item {
 
             PlasmaComponents.ToolButton {
                 icon.name: "list-add"
-                onClicked: dbus.createSession("")
+                onClicked: newSessionFolderDialog.open()
                 PlasmaComponents.ToolTip { text: "New session" }
             }
         }