Adding/removing a Warning while editing a field causes field misalignment

[cpcallen]

Describe the bug

Calls to BlockSvg.prototype.setWarningText while a field is being edited will cause the field to be misaligned with the underlying block.

To Reproduce

1. Go to the Block Factory demo (note: not, for now, the google.github.io version, as this bug is masked there by No preview shown for Block Factory #5556).
2. Click on the 'name' field.
3. Type x
4. Click on empty part of workspace.
5. Click on the 'name' field again.
6. Type block_type
7. Click on empty part of workspace again.

Expected behavior

When the warning disappears, the field in which we are entering text moves in alignment with the field displayed as part of the block.

Screenshots

Screen.Recording.2021-09-30.at.22.39.08.mov

Desktop:

• OS: macOS
• Browser Chrome
• Version 93.0.4577.82 (Official Build) (x86_64)

Stack Traces

None.

[gonfunko]

This no longer repros.