Fix #2779: Show full option name in error for multicharacter short options

[717986230]

Fixes #2779

Problem

When passing a wrong multicharacter short option like -dbgwrong, the error message incorrectly shows:

No such option: -d

instead of the full option name:

No such option: -dbgwrong

Root Cause

In _match_short_opt(), the function iterates through each character of the argument and raises NoSuchOption with just the first invalid character, not the original argument.

Solution

Modified src/click/parser.py to report the full original argument when raising NoSuchOption:

# Before:
raise NoSuchOption(opt, ctx=self.ctx)  # opt is just "-d"

# After:
raise NoSuchOption(_normalize_opt(arg, self.ctx), ctx=self.ctx)  # arg is "-dbgwrong"

Testing

• Manual testing with various multicharacter short options
• All existing tests should pass

Impact

• Improves error message accuracy
• Better user experience when debugging command-line options
• No breaking changes to API

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This PR was created with AI assistance. The fix is minimal and focused on the reported issue.