Experimental flow display

core/src/mindustry/ui/dialogs/SettingsMenuDialog.java

@@ -360,6 +360,8 @@ public class SettingsMenuDialog extends SettingsDialog{
         if(!mobile){
             Core.settings.put("swapdiagonal", false);
         }
+
+        graphics.checkPref("flow", false);
     }
 
     private void back(){

core/src/mindustry/ui/fragments/PlacementFragment.java

@@ -454,6 +454,9 @@ public class PlacementFragment extends Fragment{
         //setup hovering tile
         if(!Core.scene.hasMouse() && topTable.hit(v.x, v.y, false) == null){
             hoverTile = world.tileWorld(Core.input.mouseWorld().x, Core.input.mouseWorld().y);
+            if(hoverTile != null && hoverTile.entity != null){
+                hoverTile.entity.updateFlow(true);
+            }
         }else{
             hoverTile = null;
         }