Change line spacing

change the line spacing when composing an email. Meaning, select the text and choose a 1.15x, 1.5x or 2x line spacing or add spacing before or after paragraphs. Being able to have some extra spacing after a paragraph really helps with readability, especially when the last sentence of the paragraph ends near the edge of the page. without the extra space it looks like it’s a continuation of the same paragraph, but a double return is too much space. Also, when I copy and paste text from a source with a different line spacing it respects the old line spacing but I don't have a way to change it to match the new line spacing unless I remove all of the formatting and start again. Below are screenshots I borrowed from user Robio that helps to demonstrate why it's important.