Divergence by concurrent Tree.Edit and Tree.RemoveStyle

[hackerwins]

What happened:

Divergence by concurrent Tree.Edit and Tree.RemoveStyle

Currently, when a node has an attribute with the same key as the RemoveStyle attribute is inserted simultaneously through Tree.Edit, the attribute of the inserted node gets deleted.

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

1. Perform a Tree.RemoveStyle operation that includes an attribute with a specific key.
2. Simultaneously perform a Tree.Edit operation that inserts a node with an attribute having the same key as the attribute removed in Tree.RemoveStyle.

Anything else we need to know?:

Environment:

• Operating system:
• Browser and version:
• Yorkie version (use yorkie version):
• Yorkie JS SDK version: