Previously: #13617

Describe the bug

When changing the text within a linked segment, or moving the selection caret using arrow keys, the link popover animates repeatedly.

To reproduce

1. Navigate to Posts > Add New
2. Click the writing prompt
3. Insert some text
4. Apply a link to said text
5. Select within the linked fragment of text
6. Change the linked text, or simply use arrow keys within to change caret position
7. Note that the popover animates in response to each input

Expected behavior

The Popover should only animate once when first shown, not on input.

Screenshots

Desktop:

• OS: macOS Mojave 10.14.4 (18E226)
• Browser: Chrome Version 73.0.3683.103 (Official Build) (64-bit)
• Version: master (1df3021)