unit_testing_syntax_compatibility reports column as line+column (location[0] + location[1]) #297

Summary

UnitTestingSyntaxCompatibilityCommand reports the wrong column in every error line. In unittesting/syntax.py:

"%s:%d:%d: %s" % (syntax, location[0] + 1, location[0] + location[1], message)

location is (line, column) (0-based, as returned by sublime_api.incompatible_syntax_patterns). The line is converted correctly (location[0] + 1), but the column is computed as location[0] + location[1], i.e. line plus column, so the reported column grows with the line number and points to the wrong place. It should be location[1] + 1. Because the output is matched by result_file_regex, jumping to the error from the output panel also lands in the wrong place.

Repro (UnitTesting 1.11.1, Sublime Text 4200)

Packages/ZZ/bad.sublime-syntax (patterns start at 0-based column 12-14 on lines 9, 11, 13):

Line 9  (0-based):     - match: '(?<!a)b(?>c+)d'
Line 11 (0-based):     - match: '\Gxyz'
Line 13 (0-based):     - match: '(a)\1(?<n>q)\k<n>'

sublime_api.incompatible_syntax_patterns(...) returns [((9, 12), (0, 0), 'Negative look behind is not supported'), ((11, 12), (0, 0), '\G is unsupported'), ((13, 12), (0, 3), 'Back references are unsupported')], but the command's output is:

Packages/ZZ/bad.sublime-syntax:10:21: Negative look behind is not supported
Packages/ZZ/bad.sublime-syntax:12:23: \G is unsupported
Packages/ZZ/bad.sublime-syntax:14:25: Back references are unsupported

Columns 21, 23, 25 are 9+12, 11+12, 13+12; the real column is 12 (13 in 1-based).

Suggested fix

Use location[1] + 1 for the column.