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Problem

As you know (like #2 ), ttyui::readline has no test cases for cursor positions.
But the validity of cursor position is so critical for human-friendly UI.

A person, who presses keyboard, considers the next character input begins from the cursor position, but once the position can be far place from the valid one, she/he cannot recognize how the line could be, what words there are nor what characters are already input. WYSIWYG is completely broken!

Request

Cursor position should be tested after changes of the logic of Buffer (such as 677d06c).
Add test cases which validate the cursor position for each operation.

Backspace key after words with prefix, results a line without the prefix.
Of course, this is unnatural behavior.

Cursor position after C-A or C-E is invalid.

For reproduction, set some prefix, input words and press C-A and C-E.

C-A results bit right position than valid place. and C-E results left side than valid one.