Merge pull request #2364 from SebDelile/master

workaround tile edge smoothing maxZoom + flip

src/tiledimage.js

@@ -1964,7 +1964,8 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
         if (lastDrawn.length > 1 &&
             imageZoom > this.smoothTileEdgesMinZoom &&
             !this.iOSDevice &&
-            this.getRotation(true) % 360 === 0 && // TODO: support tile edge smoothing with tiled image rotation.
+            this.getRotation(true) % 360 === 0 && // TODO: support tile edge smoothing with tiled image rotation (viewport rotation is not a problem).
+            this._drawer.viewer.viewport.getFlip() === false && // TODO: support tile edge smoothing with viewport flip (tiled image flip is not a problem).
             $.supportsCanvas && this.viewer.useCanvas) {
             // When zoomed in a lot (>100%) the tile edges are visible.
             // So we have to composite them at ~100% and scale them up together.