Describe the bug
The \square command produces a square correctly but it also sets characters before and after it to its position.

To Reproduce
Steps to reproduce the behavior:
Type

123\square456

in the Try tab of Forms.Example.
Expected behavior
(Need research to find out)

Screenshots
(Cannot send pictures on mobile)

Environment (please complete the following information):

• Platform: [e.g. CSharpMath.SkiaSharp, CSharpMath.Forms]
• Package Version or Commit: 0.3.0-alpha
• Device: Redmi 6