Selection working partially. Needs global z-index hovering to work reliably.

src/state.h

@@ -46,6 +46,8 @@ namespace VISEQ::APP{
 			InteractionState istate = HOVER_CANVAS;
 			
 			int node_mode = 0;
+			
+			bool hovering = false;
 
 			MouseState mouse_left;
 			MouseState mouse_right;
@@ -55,6 +57,7 @@ namespace VISEQ::APP{
 			ModifierKeys keys_pressed;
 			ModifierKeys keys_released;
 
+			Rectangle selection;
 
 			Vec2Df mouse_delta;