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While working on the previous commit to fix PR cli/28665, I noticed that the 'edit' command would suffer from the same problem. That is, something like: (gdb) edit task 123 would cause GDB to break. For a full explanation of what's going on here, see the commit message for the previous commit. As with the previous commit, this issue can be prevented by detecting, and throwing, a junk at the end of the line error earlier, before calling decode_line_1. So, that's what this commit does. I've also added some tests for this issue. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28665