Add check box to remove unused tiles

apps/launcher/datafilespage.cpp

@@ -493,7 +493,11 @@ void Launcher::DataFilesPage::startNavMeshTool()
 
     mNavMeshToolProgress = NavMeshToolProgress {};
 
-    if (!mNavMeshToolInvoker->startProcess(QLatin1String("openmw-navmeshtool"), QStringList({"--write-binary-log"})))
+    QStringList arguments({"--write-binary-log"});
+    if (ui.navMeshRemoveUnusedTilesCheckBox->checkState() == Qt::Checked)
+        arguments.append("--remove-unused-tiles");
+
+    if (!mNavMeshToolInvoker->startProcess(QLatin1String("openmw-navmeshtool"), arguments))
         return;
 
     ui.cancelNavMeshButton->setEnabled(true);

files/ui/datafilespage.ui

@@ -74,6 +74,16 @@
          </item>
         </layout>
        </item>
+       <item>
+        <widget class="QCheckBox" name="navMeshRemoveUnusedTilesCheckBox">
+         <property name="text">
+          <string>Remove unused tiles</string>
+         </property>
+         <property name="checked">
+          <bool>true</bool>
+         </property>
+        </widget>
+       </item>
        <item>
         <widget class="QPlainTextEdit" name="navMeshLogPlainTextEdit">
          <property name="enabled">