Autocomplete adds spaces before mention-parameter

[SystemKeeper]

Video:

Bildschirmaufnahme.2023-05-16.um.21.29.13.mov

This is reproducible when sending messages in Talk and mentioning someone. You only had 1 space before the "@" when writing the message, but have 3 spaces after sending it.

[Antreesy]

nextcloud-vue/src/mixins/richEditor/index.js

Lines 148 to 150 in cb58beb

	// Mount and get raw html
	Item.$mount(mount)
	const renderedHtml = wrapper.innerHTML

As HTML replaces new lines, empty lines and consecutive whitespaces with a single whitespace, which parseContent() can't trim, we might look for a solution to make it manually. So far works:

const renderedHtml = wrapper.innerHTML.replace(/>\s+</g, '><')

See discussion at #5359 (comment)