macOS might have no GTK configuration, so forcing "only icons" for toolbar.

ui/mainwindow_init.go

@@ -156,6 +156,10 @@ func (m *MainWindow) Initialize() {
 
     m.window.Add(m.vbox)
 
+    if runtime.GOOS == "darwin" {
+        m.initializeMacAfter()
+    }
+
     m.window.ShowAll()
 
     // Launch events.

ui/mainwindow_init_mac.go

@@ -21,6 +21,10 @@ func (m *MainWindow) initializeMac() {
     }
 }
 
+func (m *MainWindow) initializeMacAfter() {
+    m.toolbar.SetStyle(gtk.TOOLBAR_ICONS)
+}
+
 func (m *MainWindow) initializeMacMenu() {
     // This is a placeholder, in future we will use native mac menu.
     // For now it launches default menu initialization.