Reverting getBounds to bound to avoid excessive loading of tiles.

lib/pixi/deepzoom/image.js

@@ -635,7 +635,7 @@ export class DeepZoomImage extends PIXI.Container {
     }
 
     worldBounds() {
-        let viewBounds = this.app.scene.getBounds()
+        let viewBounds = this.app.scene.bounds // UO: Never use getBounds()
         // Using getBounds extends visible scope after loading tiles and leads
         // to excessive loading
         if (this.world != null) {
@@ -1039,7 +1039,7 @@ export class DeepZoomImage extends PIXI.Container {
             this.ensureTiles(this.currentLevel, event.about)
             return
         }
-        
+
         let level = this.levelForScale(event.scale)
         let newLevel = Math.max(level, this.minimumLevel)
         if (newLevel != this.currentLevel) {
@@ -1076,15 +1076,12 @@ export class DeepZoomImage extends PIXI.Container {
    */
     deactivate() {
         this.destroyAllTiles()
-        Object.keys(this.tileLayers).forEach(key => {
-            this.destroyTiles(key)
-        })
         this.tileContainer.destroy({ children: true })
         printTileCacheInfos()
     }
 
     throwFinished() {
-        console.log("throwFinished")
+        //console.log("throwFinished")
         let key = this.currentLevel.toString()
         let currentTiles = this.tileLayers[key]
         if (typeof currentTiles == 'undefined') {