fixed a flood-fill rounding bug.

Again, thanks, @Simon-Mong !

history.txt

@@ -3695,6 +3695,7 @@ Fixes:
 ------
 * Objects: make sure to fully remove parts from their anchor when deleting them
 * Objects: fixed a bounding-box-detection bug in Costumes. Thanks, Simon Mong!
+* Objects: fixed a flood-fill rounding bug. Thanks, Simon Mong!
 
 
 

objects.js

@@ -4274,7 +4274,7 @@ SpriteMorph.prototype.floodFill = function () {
         img = ctx.getImageData(0, 0, width, height),
         dta = img.data,
         stack = [
-            ((height / 2) - Math.round(this.yPosition())) * width +
+            Math.round((height / 2) - this.yPosition()) * width +
             Math.round(this.xPosition() + (width / 2))
         ],
         current,