6693- Fixed replacing lists and odd spacing

[lzach83]

Link to Issue

Closes: #6693

Description of Changes

• Fixes an issue where if you have a current list and want to change list types it would just append to the front instead of replacing the list
• In lists this also fixes the odd spacing where when you copied the string it would apply extra \n in between

"How We Fixed It"

• Edited createListHandler to check if there's a previous prefix and append/replace with the new one
• Trim the ends of the strings in order to eliminate the odd spacing in the lists

Test Plan

• Go to create a thread or comment
• Highlight and create a list
• then switch between all of the lists
• Copy the contents
• Paste somewhere and ensure the spacing is correct

[jnaviask]

Going between bullet list and numbered list inserts a space at the beginning of each line.

[lzach83]

@jnaviask Should be fixed now, thank you

[masvelio]

I am not sure what works and what does not in this PR, but I am listing out things that definitely do not. Please explain which of those supposed to be fixed in this PR and if we have tickets/PRs for other issues.

1. on create thread page load I have this error Uncaught TypeError: Cannot read properties of undefined (reading '___isMarkdown') at eval (react_quill_editor.tsx:112:1) - (0:01s)
2. list buttons do not work - they do not insert list into the text field - (0:05s)
3. when I highlight list items and select ordered list, the list has not have order but every element has number .1 - (0:14s)
4. pasting the list copied seconds ago gives line breaks even though there was no line break before, in editor and outside - (0:38s)

Kapture.2024-02-20.at.16.12.23.mp4

[lzach83]

This will end up getting closed by #6512 leaving open until it gets merged.

[lzach83]

#6512 Merged -- this ticket is redundant