Fix a bug for using greedy match to get indent width

[miyake13000]

Overview

Before:

• Using greedy match to get indent width when wrapping line

• Example:

  + xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  

  • This is converted to:

  (A) xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
      xxxxxxxxxxxx
  

  • However, in below case...

  + xxxxxxxxxxxxxxxxxxxx (foo) xxxxxxxxxxxxxx
  

  • Internaly, this is converted to

  (A) xxxxxxxxxxxxxxxxxxxx (foo) xxxxxxxxxxxxxx
  ↑    greedy  match result    ↑
  

  • So, this becomes

  (A) xxxxxxxxxxxxxxxxxxxx (foo) xxxxxxx
                                 xxxxxxx
  

• And, this indent mistake cause a bug because

  • If paragraph_position (L. 828) sets position to exceed max_width, infinity recursive calls occurs in fill_column (L. 856)

After:

• Fix regex to use lazy match (.+ -> .*?)

• Example:

  (A) xxxxxxxxxxxxxxxxxxxx (foo) xxxxxxxxxxxxxx
  ↑ ↑ match
  

  • This is converted to

  (A) xxxxxxxxxxxxxxxxxxxx (foo) xxxxxxx
      xxxxxxx
  

• And, fix rege from .+ -> .* so that regex matches even when the parentheses are empty