New icon

core/src/io/anuke/mindustry/editor/WaveInfoDialog.java

@@ -88,7 +88,7 @@ public class WaveInfoDialog extends FloatingDialog{
                 buildGroups();
             }).growX().height(70f);
         }), new Label("$waves.none"){{
-            visible(groups::isEmpty);
+            visible(() -> groups.isEmpty());
             touchable(Touchable.disabled);
             setWrap(true);
             setAlignment(Align.center, Align.center);

core/src/io/anuke/mindustry/maps/filters/MirrorFilter.java

@@ -17,11 +17,12 @@ public class MirrorFilter extends GenerateFilter{
 
     {
         options(new SliderOption("angle", () -> angle, f -> angle = (int)f, 0, 360, 45));
+        buffered = true;
     }
 
     @Override
     protected void apply(){
-        v1.trns(angle - 90, 1f);
+        v1.trnsExact(angle - 90, 1f);
         v2.set(v1).scl(-1f);
 
         v1.add(in.width/2f - 0.5f, in.height/2f - 0.5f);