fix main tab icon initialization

src/editor.cpp

@@ -1247,6 +1247,7 @@ void Editor::unsetMap() {
         for (auto connection : map->getConnections())
             disconnectMapConnection(connection);
     }
+    clearMapConnections();
 
     this->map = nullptr;
 }

src/mainwindow.cpp

@@ -220,6 +220,7 @@ void MainWindow::applyUserShortcuts() {
             shortcut->setKeys(shortcutsConfig.userShortcuts(shortcut));
 }
 
+void MainWindow::initCustomUI() {
     static const QMap<int, QString> mainTabNames = {
         {MainTab::Map, "Map"},
         {MainTab::Events, "Events"},
@@ -236,7 +237,6 @@ static const QMap<int, QIcon> mainTabIcons = {
         {MainTab::WildPokemon, QIcon(QStringLiteral(":/icons/tall_grass.ico"))},
     };
 
-void MainWindow::initCustomUI() {
     // Set up the tab bar
     while (ui->mainTabBar->count()) ui->mainTabBar->removeTab(0);