Remember commit message draft on quit

[TristanK27]

There are multiple steps in my workflow where I add something to the commit message, and I've grown accustomed to this way of doing things. My current tool of choice is lazygit, which always remembers the Git commit message.

In gitui, when a typo or misclick occurs and the program closes, my entire commit message is gone with it. It would be nice if the message were retained.

My proposal is to add a "remember commit message" feature to gitui, similar to how it’s done in lazygit.
What is your opinion?

Steps to reproduce

1. Enter a commit message into the commit floating window.
2. Quit gitui.
3. Open gitui.
4. Press 'c' in staged changes.

Desired behavior:

Show the commit message as the user left it before closing the program.

Actual behavior:

The commit message is empty.

[extrawurst]

I think thats a good idea!
By default i think we should store the draft message until its explicitly cleared or commited.
PR welcome