fix: newline behavior for heading and paragraphs tags

[atarek12]

Related Ticket: #8040

Description of Changes:

• Enabling the Enter key to insert line-break for inline editors.
• I have forced the behavior to be line-break for the inline editors whenever we have P and h* tags as root blocks as we cannot insert the Block break inside them.

Pre-checks:

• Changelog entry added
• Tests have been added (if applicable)
• Branch prefixed with feature/, hotfix/ or spike/

Review:

• Milestone set
• Docs ticket created (if applicable)

GitHub issues (if applicable): #8040

[atarek12]

@TheSpyder @spocke any updates for this PR?

[TheSpyder]

Apologies for the lack of follow up on this. We're scheduled to look at it soon. I'm not sure whether your PR is the right approach; I was suspecting something in the invert logic might be wrong, or perhaps ContextSelectors.shouldInsertBr() should also match the inline root block.

If it is the right approach I'd want to adjust the logic to use an existing defined list of blocks rather than hard coding extra ones after summary, but that's not a simple task.

tinymce/modules/tinymce/src/core/main/ts/dom/ElementType.ts

Lines 4 to 11 in ece3bf7

	const blocks = [
	'article', 'aside', 'details', 'div', 'dt', 'figcaption', 'footer',
	'form', 'fieldset', 'header', 'hgroup', 'html', 'main', 'nav',
	'section', 'summary', 'body', 'p', 'dl', 'multicol', 'dd', 'figure',
	'address', 'center', 'blockquote', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6',
	'listing', 'xmp', 'pre', 'plaintext', 'menu', 'dir', 'ul', 'ol', 'li', 'hr',
	'table', 'tbody', 'thead', 'tfoot', 'th', 'tr', 'td', 'caption'
	];

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