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Help panel: Add animation when opening the popup

Authored by Catrope on Jan 4 2019, 12:47 AM.

Description

Help panel: Add animation when opening the popup

This uses the animations from Rita's prototype (fade in and slide
upwards) but implements them with transitions instead. This was easier
because it piggy-backs on OOUI's existing transitions on modal windows.

Bug: T212887
Change-Id: I810d93801d65df83be8481811891db39a3ed68ff