I often find myself switching between Live Preview and Source mode. It’s difficult to switch between them, and sometimes difficult to tell which mode I’m in.
Proposed solution
Have the Edit mode icon switch to the Source view icon when Source view is active. (This presumes that the icon changes to reflect the current state of the window, which is already what I expect and want.)
Have an option under Editor options to cycle through all three modes when selecting the Edit mode icon. Alternately, have some other easier way to access Source view, such as by long-pressing the Edit mode icon.