[Request] implement vertical bar cursor shape

[phdoerfler]

I like CRT's block cursor but there are moments where I'd want a vertical bar cursor. Other terminal emulators support this, e.g., tilix or the default gnome / Ubuntu terminal.

Take (neo-)vim for instance. Switching to insert mode changes the cursor to a vertical bar which is nice for inserting text as you have a more precise indication where you will be adding text, similar to most GUI text editors. As seen here in insert mode, there is a vertical bar cursor: whereas in normal mode, there is a block cursor:

However, in CRT the cursor does not change when switching to insert mode. Again, insert mode, but this time with a block cursor: And normal mode with the expected block cursor:

[Konglomneshued]

I'd like this, too.