float the selection panel over the game world instead of a side column

src/ui/FieldSelectionPanel.cpp

@@ -33,7 +33,7 @@ FieldSelectionPanel::FieldSelectionPanel(Simulation* sim,
     , m_sim(sim)
     , m_config(config)
 {
-    // Zero margins and the same spacing as the enclosing SelectedBuildingPanel layout, so
+    // Zero margins and the same spacing as the enclosing SelectionPanel layout, so
     // nesting the field widgets in this panel leaves their geometry unchanged.
     m_layout = new QVBoxLayout(this);
     m_layout->setContentsMargins(0, 0, 0, 0);