Identical expression 'm[1]' to the left and to the right of compound assignment

[Goshya]

Description

func (s *linkifyParser) Parse(....) ast.Node {
  ....
  if m != nil {
    lastChar := line[m[1]-1]
    if lastChar == '.' {
      m[1]--
    } else if lastChar == ')' {
      ....
    } else if lastChar == ';' {
      i := m[1] - 2
        for ; i >= m[0]; i-- {
          if util.IsAlphaNumeric(line[i]) {
            continue
          }
          break
        }
        if i != m[1]-2 {
          if line[i] == '&' {
            m[1] -= m[1] – i               // <=
          }
        }
      }
    }
  ....
}

Obviously, subtracting its own value from m[1] makes no sense.
A strange piece of code was found inside the linkify.go file on line 108.

Gitea Version

...

Can you reproduce the bug on the Gitea demo site?

Yes

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Git Version

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Operating System

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How are you running Gitea?

...

Database

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