Feature Request: rename by keeping existing text

Current implementation deletes the entire name to be renamed and user has to enter the entire new name.
Often, especially with long name, we want to have a small modification like fixing a typo or adding a letter/word.
PyCharm has a nice implementation that keeps the previous text, allowing to edit/overwrite it and then re-factor the code.

The issue identifies jedi-vim's rename/refactor flow but names no files or tests. Start by locating the rename command and compare its current input behavior with the requested text-preserving edit; done means the existing name remains available for modification before refactoring.

Written by the indexing model from the issue text.