Store additional meta value into database with each new comment
Only display comments with specific meta_value
Display all comments and display attribute data-incom-comment with each comment
Display comments using wp_list_comments()
Set a new value for meta_key 'data_incom' before a comment will be stored into DB
Store value of 'data-incom' as meta_value for meta_key 'data_incom' with each new comment
If someone submits a comment but does not use the inline comments form -> set meta_value = NULL
Only display comments that are assigned to the income-active element
Don't display elements that should not be visible at first. Added display:none inline to guarantee that this CSS is loaded (independent from the plugin's stylesheet file)