Bugfix on v0.6.3: animation with delay of 1.0 seconds not working

[Sriram Sami]

A user noticed that animations would not properly apply (animation time would be 0 seconds) if the desired animation period was set to 1 second.

The root cause was because we were actually adding animations too fast - since Slides' own default animation period is 1 second, we didn't have to wait to change the animation time to something else, so we could add the entire animation in around 1 millisecond.

However, adding an animation this inhumanly fast causes Google Slides to not properly set the animation time. It was previously possible to trigger this (even as a user!) by clicking on "Add Animation" many times quickly.

This bug is fixed in v0.6.3 by adding a minimum time to add a new animation (500 milliseconds).