Fix nbsp breaking tables

Author: Crozzers

lib/markdown2.py

@@ -3576,7 +3576,7 @@ def run(self, text):
         return table_re.sub(self.sub, text)
 
     def sub(self, match: re.Match) -> str:
-        trim_space_re = '^[ \t\n]+|[ \t\n]+$'
+        trim_space_re = r'^\s+|\s+$'
         trim_bar_re = r'^\||\|$'
         split_bar_re = r'^\||(?<![\`\\])\|'
         escape_bar_re = r'\\\|'

test/tm-cases/tables_nbsp_issue629.html

@@ -0,0 +1,14 @@
+<table>
+<thead>
+<tr>
+  <th>A</th>
+  <th>B</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+  <td>Foo</td>
+  <td>123</td>
+</tr>
+</tbody>
+</table>

test/tm-cases/tables_nbsp_issue629.opts

@@ -0,0 +1 @@
+{'extras': ['tables']}

test/tm-cases/tables_nbsp_issue629.text

@@ -0,0 +1,3 @@
+| A   | B   |
+|-----|-----| 
+| Foo | 123 |