[Pidgin] #15738: purple_markup_strip_html does more than described in the docs

[Pidgin]

#15738: purple_markup_strip_html does more than described in the docs
---------------------+-----------------------
 Reporter:  seishun  |      Owner:
     Type:  defect   |     Status:  new
Milestone:           |  Component:  libpurple
  Version:  2.10.7   |   Keywords:
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 According to the
 [https://developer.pidgin.im/doxygen/2.10.5/html/util_8h.html#a29de8afd351d5d27b8e741d470cdb71c
 docs], the purple_markup_strip_html function should only strip HTML tags
 from the string. However, it replaces "<br>" with a newline, and
 additionally unescapes HTML entities to their literal characters.

 For example, given the following string:

 `(5:50:14 PM) <font size="3">DrKoljan:
 <a>link1</a><br>(5:50:18 PM) DrKoljan:
 <a>link2</a></font>`

 purple_markup_strip_html returns the following:

 `(5:50:14 PM) DrKoljan: <a>link1</a>`

 The expected output is as follows:

 `(5:50:14 PM) DrKoljan: <a>link1</a>(5:50:18 PM) DrKoljan:
 <a>link2</a>`

 Since the current behavior is more useful, perhaps the docs should be
 updated to reflect it instead.

-- 
Ticket URL: <https://developer.pidgin.im/ticket/15738>
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