Well, ykeyke, at first please remember the topic of this thread:
Action based on actions.
We are now at a point to make clear and define the area of the current theme:
How to change the appearance of multiple text lines in tag-fields?
How to create the typographic design of paragraphs?
With respect to the handling of tag-fields, which can store multiple text characters in free style, as provided by Mp3tag.
Typically a text paragraph consists of one or more sentences.
The number of sentences is not a determinant in defining a paragraph.
The start of a paragraph is indicated by beginning on a new line ...
... in an appropriate area on the left or right edge of the line, depending on the currently used LeftToRight or RightToLeft oriented language.
Professional text processing offers different ways to make a paragraph visible to the reader by indenting the text line by 'en space' or 'em space' at the beginning of the paragraph's first text line.
Sometimes paragraphs are indented by three to five standard space characters.
Another technique is to insert vertical space between paragraphs.
This creates what is sometimes known as 'block paragraphs'.
Pressing twice the key [Enter] is often used to create this break, whereas word processing applications may use increased leading to create a more pleasing space between paragraphs.
Mp3tag supports only conventional text processing, not word processing.
Because Mp3tag is a Windows application, it uses a sequence of two control characters to terminate a text line (Carriage Return and LineFeed resp. D A resp. \r\n resp. $char(13)$char(10)).
When working in the dialog "Extended Tags...", for example in a tag-field UNSYNCEDLYRIS one can force a line break by pressing the key combination [Ctrl]+[Enter], then Mp3tag inserts the two invisible control characters 'D A' and the cursor will be placed into the following new line of the multi line edit field.
When pressing again the key combination [Ctrl]+[Enter], then Mp3tag again inserts the two invisible control characters 'D A' and the cursor will be placed into the following new line of the multi line edit field, giving one empty line between the previous text line and the cursor.
A new 'block paragraph' can begin from there.