fixing some GIF zooming glitches

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/PhotoFragment.kt

@@ -224,6 +224,7 @@ class PhotoFragment : ViewPagerFragment() {
         // avoid GIFs being skewed, played in wrong aspect ratio
         if (mMedium.isGIF()) {
             mView.onGlobalLayout {
+                measureScreen()
                 Handler().postDelayed({
                     loadGif()
                 }, 50)

app/src/main/kotlin/com/simplemobiletools/gallery/pro/views/MyZoomableGifTextureView.kt

@@ -50,6 +50,7 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
             return
         }
 
+        mSaveScale = 1f
         mGifWidth = gifWidth.toFloat()
         mGifHeight = gifHeight.toFloat()
         mScreenWidth = screenWidth.toFloat()