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bug [#27779] Python console completion broken
modified auto-completion, though this may need to become a preference.
The problem is:
- including _all_ text as a prefix can take a lot of space, and isnt too readable.
- including only the previous word is error prone because detecting delimiters can fail when editing strings.

so I've set it to only include the last part of the string but align to the cursor to make it more readable.