fix bug with incorrect shimmering size after requestLayout called

[VitalyNikonorov]

There is incorrect shimmer animation after child view has been changed.
E.g.

        childView.setText(newText);
        shimmerLayout.startShimmerAnimation();

If length of newText and text in childView is differ, than shimmer animation will be not correct

[veghtomi]

Hi @VitalyNikonorov, thanks for the pull request. I will have a look at it at the end of the week!

[veghtomi]

@VitalyNikonorov I checked the pull request. So yes, there is this bug that if you change the text for example after measure and layout phase and start the animation.

However, if the animation is ongoing and I change the text, the animation will not be proper after applying your fix.

[veghtomi]

Check the conversation.

[VitalyNikonorov]

@veghtomi I've made some changes. Now animation works with correct animating interval, but it does not take into account the correct position of shimmer mask (interpolator and size changes adjustment is required)

[veghtomi]

@VitalyNikonorov thanks for the fix, I will check it soon!