Canvas: Fix inconsistent element placement when changing element type

[linghaoSu]

Which issue(s) does this PR fix?:

fix placement reset when change element type

Fixes #74941
Fixes #74222

result:

2023-09-15.00.41.17.mov

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[CLAassistant]

All committers have signed the CLA.

[nmarrs]

LGTM - one nit on fallback top / left of icon. Thanks for your contribution!

[nmarrs]

Hi @linghaoSu - to fix the build I believe we need to rebase your PR branch onto latest main. As I do not have write permissions to your branch you will need to first pull latest main branch, switch to your PR branch and run git merge origin main and push.

Thanks!