fix watch mode parsing of self-closing div in svg

[gavin-ts]

Summary

Fixes a bug where the svg structure could become corrupted in watch mode due to a self-closing div.

Details

• fixes lost connector #1084
• when setting innerHTML in watchmode, it would parse a self-closing div incorrectly
• Issue seems to be from self closing div tags being invalid in html. https://stackoverflow.com/a/206409
• Note: in windows, a md label block is considered not an empty label, containing a \r char. However this can also happen without CRLF endings a md block with 2 newlines :

example with 2 newlines:

you: {shape: person}
you -> form
form: {
  get: |md


  |
}

before the svg is parsed incorrectly when setting innerHTML

self closing div ends up parsed as an open div tag

after svg is valid xhtml and parsed correctly

[nhooyr]

Makes sense