Bug: CSV Comments header get overwritten and break file

[silverOrdeal]

The current comment handling logic for csv seems to no expect a comment header. Starting to edit a csv will start to result in the csv header getting overwritten, if the user starts to input in a non-linear way (for example diagonally)

This is particularly annoying for folks requiring a comment header to their csv file.

See : https://www.w3schools.io/file/csv-comments/#:~:text=CSV%20contains%20comma%2Dseparated%20values,and%20read%20the%20CSV%20comments. for an example of a comment "Header", and below for

Screenshot :

Sample :

# ============================================================
# Comment example
# In this area we can describe different aspect of the CSV file
# Without impacting csv data.
# ============================================================

column, column, column, column

Steps to reproduce

1. Create a csv file with the above content
2. Open Raw file to the side
3. Start to input some values in the editor across different columns and row. IMPORTANT : try to be random, and input non-sequentially (for example, input a column in sequence, then go to a previous row on another cell. This triggers the behaviour more consistently.
4. See how the csv is updated from the top of the file, conflicting with comments and not saving properly.

Fix : Ensure that lines starting with the comment symbol are skipped when updating the csv file.