Steps to reproduce

Apply word_wrap to a block of text that contains some indented lines:

    This is a paragraph with an initial indent,
followed by additional lines that are not indented,
and finally terminated with a blockquote:
  "A pithy saying by a wise person"

Expected behavior

A line break should be inserted at the appropriate character limit, but the leading spaces should not be removed. For example, if str contains the example above, word_wrap(str, line_width: 25) should produce:

    This is a paragraph
with an initial indent,
followed by additional
lines that are not
indented,
and finally terminated
with a blockquote:
  "A pithy saying by a
wise person"

Actual behavior

For any line that exceeds the configured length, white space is stripped from the beginning as well as the end of the line, even though that leading white space was included in the character count that determined how long the line was:

This is a paragraph
with an initial indent,
followed by additional
lines that are not
indented,
and finally terminated
with a blockquote:
"A pithy saying by a
wise person"

System configuration

Rails version: All
Ruby version: All