Menu to formate text is hard to find

[dab246]

Specs

I suggest saving the user's preferences when they send the email/close the mail composer.

This way, if I open several mail editors, the behavior is the same as for a single composer:

I open or hide the text formatting menu according to the user's preferences.

Each time the user closes the mail composer (by sending an email or closing the mail composer), we save their preferences. When I save a new user behavior, I don't change anything in the mail composer that are already open. For example, I open two mail composers with the text formatting menu open. In the first mail composer, I click to hide the menu and close that composer (the new user preference is “menu closed”), but in the second composer that is already open, the menu remains open.

Additionally, I want to be able to toggle the menu visibility anytime by clicking the ‘Aa’ button.