Added support for Mac file association; minor optimizations

core/src/io/anuke/mindustry/input/AndroidInput.java

@@ -215,6 +215,11 @@ public class AndroidInput extends InputHandler implements GestureListener{
         }}.visible(() -> !state.is(State.menu)).end();
     }
 
+    @Override
+    public boolean isDrawing(){
+        return selection.size > 0 || removals.size > 0;
+    }
+
     @Override
 	public void drawBottom(){
 

core/src/io/anuke/mindustry/input/DesktopInput.java

@@ -60,6 +60,11 @@ public class DesktopInput extends InputHandler{
         }
     }
 
+    @Override
+    public boolean isDrawing(){
+        return mode != none;
+    }
+
     @Override
     public void drawBottom(){
         Tile cursor = tileAt(control.gdxInput().getX(), control.gdxInput().getY());

core/src/io/anuke/mindustry/input/InputHandler.java

@@ -81,6 +81,10 @@ public abstract class InputHandler extends InputAdapter{
 
 	}
 
+	public boolean isDrawing(){
+		return false;
+	}
+
 	/**Handles tile tap events that are not platform specific.*/
 	public boolean tileTapped(Tile tile){
 		tile = tile.target();