The animation image will be hide during IDMPhotoBrowser is launching

[jerrylee007]

When launching the IDMPhotoBrowser, the animation process is hide when the IDMPhotoBrowser is launching, which will give user a feel that the image is moving to the target position, then disappear for a while, and finally show the actual image.

This fix will make sure the IDMPhotoBrowser is transparent before the animation is down, which makes the animation very smooth.

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This change is