Speech bubbles do not follow dragged sprites

[adroitwhiz]

Expected Behavior

When a sprite is dragged in the editor, its speech bubble should stay attached to it.

Actual Behavior

When a sprite is dragged in the editor, its speech bubble remains where the sprite was "picked up", and only moves once the sprite is no longer being dragged:

Steps to Reproduce

1. Enter the project editor
2. Make a sprite say something
3. Drag the sprite

Operating System and Browser

Fedora Linux, Firefox 73

[adroitwhiz]

Fun fact: #1977 doesn't show up if you search for "bubbles"