[w3c/editing] RFC: Contenteditable "indent" implementations are not aligned with popular editors (Issue #437)

**Summary**: When a line break is inserted within a block, popular editors treat the text after the line break as part of the same block for the purposes of indentation/quoting. No user agent implementation of the "indent" command is doing this. Should they be?

### Web App Editors
#### Test Case
_N.B. This is for editors that support Shift+Enter as a way to create a newline without creating a new block, and have an indent or quote feature._

1. Type "New block 1"
2. Press Shift+Enter
3. Type "New line in block 1"
4. Press Enter
5. Type "New block 2"
6. Move the caret in front of the "N" in "New block 1" (i.e. no text is selected)
7. Use the editor's indent or quote function

#### Results
* Google Docs indents "New block 1" and "New line in block 1"
* Microsoft 365 Word indents "New block 1" and "New line in block 1"
* Zoho Writer indents "New block 1" and "New line in block 1"
* iCloud Pages indents "New block 1" and "New line in block 1"
* Confluence Pages indents "New block 1" and "New line in block 1"
* Nuclino indents "New block 1" and "New line in block 1"
* Coda indents "New block 1" and "New line in block 1"
* Notion indents "New block 1" and "New line in block 1"
* WordPress indents "New block 1" and "New line in block 1"
* Medium indents "New block 1" and "New line in block 1" _(Note: Medium's editor won't let you indent without selecting something, so select just the "N" of "New block 1" first.)_

### Content Editable In User Agents
#### Test Case
1. Load `data:text/html,<div contenteditable="true"></div><button onclick="document.execCommand('indent', false);">indent</button>`
2. Give the div focus and type "New block 1"
3. Press Shift+Enter
4. Type "New line in block 1"
5. Press Enter
6. Type "New block 2"
7. Move the caret in front of the "N" in "New block 1" (i.e. no text is selected)
8. Click the "indent" button

#### Results
* Chromium:
    * Prior to indent: `<div contenteditable="true">New block 1<br>New line in block 1<div>New block 2</div></div>`
    * Indent only indents "New block 1"
    * _Note: I'm locally experimenting with Chromium's indent/outdent feature as part of some bug fixing. It should not be difficult to bring Chromium into alignment with the popular editors IF consensus is that it should be done._
* WebKit:
    * Prior to indent: `<div contenteditable="true">New block 1<br>New line in block 1<div>New block 2</div></div>` 
    * Indent only indents "New block 1"
* Gecko:
    * Prior to indent: `<div contenteditable="true">New block 1<br><div>New line in block 1</div><div>New block 2<br></div></div>`
    * Indent only indents "New block 1"

### Questions
* Would it be a good idea to bring the user agents into alignment with the popular editors?
* If so, should that be stated in a spec somewhere for interoperability?

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