show restricted build area when using schematic (#2109)

core/src/mindustry/graphics/OverlayRenderer.java

@@ -97,7 +97,7 @@ public class OverlayRenderer{
 
         input.drawTop();
 
-        buildFade = Mathf.lerpDelta(buildFade, input.isPlacing() ? 1f : 0f, 0.06f);
+        buildFade = Mathf.lerpDelta(buildFade, input.isPlacing() || input.isUsingSchematic() ? 1f : 0f, 0.06f);
 
         Draw.reset();
         Lines.stroke(buildFade * 2f);

core/src/mindustry/input/InputHandler.java

@@ -202,6 +202,10 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
         };
     }
 
+    public boolean isUsingSchematic(){
+        return !selectRequests.isEmpty();
+    }
+
     public OverlayFragment getFrag(){
         return frag;
     }