More nvim notes...

Doing non-Insert things while remaining in Insert mode:

• Ctrl-[: leave Insert mode, same as Esc (and often easier to reach)
• Ctrl-o: one Normal command, then back to Insert.
• Ctrl-w delete previous word.
• Ctrl-u delete back to start of line.
• Ctrl-h backspace, often easier than reaching for Backspace.
• Ctrl-t: increase indent
• Ctrl-d: decrease indent
• Ctrl-r 0: insert last yanked text