Match all whitespace

This might be too inclusive. And doesn't address the XPath matching.

lib/task_list/filter.rb

@@ -31,9 +31,11 @@ def self.filter(*args)
   #   :task_list_items - An array of TaskList::Item objects.
   class Filter < HTML::Pipeline::Filter
 
-    Incomplete     = "[ ]".freeze
-    IncompleteNBSP = "[\xC2\xA0]".freeze
-    Complete       = "[x]".freeze
+    Incomplete = "[ ]".freeze
+    Complete   = "[x]".freeze
+
+    IncompletePattern = /\[[[:space:]]\]/.freeze # matches all whitespace
+    CompletePattern   = Regexp.escape(Complete).freeze
 
     # Pattern used to identify all task list items.
     # Useful when you need iterate over all items.
@@ -42,9 +44,8 @@ class Filter < HTML::Pipeline::Filter
       (?:\s*[-+*]|(?:\d+\.))? # optional list prefix
       \s*                     # optional whitespace prefix
       (                       # checkbox
-        #{Regexp.escape(Complete)}|
-        #{Regexp.escape(Incomplete)}|
-        #{Regexp.escape(IncompleteNBSP)}
+        #{CompletePattern}|
+        #{IncompletePattern}
       )
       (?=\s)                  # followed by whitespace
     /x
@@ -53,11 +54,9 @@ class Filter < HTML::Pipeline::Filter
       # select UL/OL
       ".//li[starts-with(text(),'[ ]')]/..",
       ".//li[starts-with(text(),'[x]')]/..",
-      ".//li[starts-with(text(),'[\xC2\xA0]')]/..",
       # and those wrapped in Ps
       ".//li/p[1][starts-with(text(),'[ ]')]/../..",
-      ".//li/p[1][starts-with(text(),'[x]')]/../..",
-      ".//li/p[1][starts-with(text(),'[\xC2\xA0]')]/../.."
+      ".//li/p[1][starts-with(text(),'[x]')]/../.."
     ].join(' | ').freeze
 
     # Selects all LIs from a TaskList UL/OL

test/task_list/filter_test.rb

@@ -80,12 +80,24 @@ def test_handles_encoding_correctly
 
   # NOTE: This is an edge case experienced regularly by users using a Swiss
   # German keyboard.
+  # See: https://github.com/github/github/pull/18362
   def test_non_breaking_space_between_brackets
     text = "- [\xC2\xA0] ok"
     assert item = filter(text)[:output].css('.task-list-item').pop, "item expected"
     assert_equal 'ok', item.text.strip
   end
 
+  # See: https://github.com/github/github/pull/18362
+  def test_non_breaking_space_between_brackets_in_paras
+    text = <<-md
+- [\xC2\xA0] one
+- [\xC2\xA0] this one will be wrapped in a para
+
+- [\xC2\xA0] this one too, wtf
+    md
+    assert_equal 3, filter(text)[:output].css(@item_selector).size
+  end
+
   protected
 
   def filter(input, context = @context, result = nil)