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readline: add questionCancel() method to cancel ongoing question

Rodrigo Muino Tomonari requested to merge github/fork/mattiasrunge/readline-question-abort into master

In some cases a question asked needs to be canceled. For instance it might be desirable to cancel a question when a user presses ctrl+c and triggers the SIGINT event. Also an initial empty string was set for this.line since the cursor methods fail if line is not initialized. This happend in the tests when a question is asked and canceled before any input has been received which would set line to a string. This is due to questionCancel calling clearline.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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