Fix the bug that wrong cmd hit when the cmd text is duplicated in the…

[elsid139]

Bug Description:
I added 2 commands, command_keyword='build' and command_keyword='signature'.
Both have is_card_callback_command = False.
As a user typed in such command string: "build start name=release_1.2.0_qa_build_no_signature_check", within which "signature" is just dup to that "signature" command.
He had meant to use "build", but "signature" rather than "build" was hit.

[mochipon]

I am experiencing the exact same problem.

For backward compatibility, I think it would be a good idea to allow the user to choose for each command whether the command_keyword must be at the beginning or whether it can appear anywhere in the text.

[fbradyirl]

For backward compatibility, I think it would be a good idea to allow the user to choose for each command whether the command_keyword must be at the beginning or whether it can appear anywhere in the text.

Agreed.