Render table with trailing whitespace (dart-lang/markdown#391)

pkgs/markdown/CHANGELOG.md

diff --git a/pkgs/markdown/CHANGELOG.md b/pkgs/markdown/CHANGELOG.md
index 2f7969f..e22c442 100644
--- a/pkgs/markdown/CHANGELOG.md
+++ b/pkgs/markdown/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 * Breaking change: Change the type of `parseInline`'s parameter from `String?`
   to `String`.
+* Fix table-rendering bug when table rows have trailing whitespace.
+  [#368](https://github.com/dart-lang/markdown/issues/368).
 
 ## 4.0.1
 

pkgs/markdown/lib/src/block_parser.dart

diff --git a/pkgs/markdown/lib/src/block_parser.dart b/pkgs/markdown/lib/src/block_parser.dart
index 49ee387..7e67c19 100644
--- a/pkgs/markdown/lib/src/block_parser.dart
+++ b/pkgs/markdown/lib/src/block_parser.dart
@@ -49,7 +49,8 @@
     RegExp(r'^([ ]{0,3})(\d{1,9})([\.)])(([ \t])([ \t]*)(.*))?$');
 
 /// A line of hyphens separated by at least one pipe.
-final _tablePattern = RegExp(r'^[ ]{0,3}\|?( *:?\-+:? *\|)+( *:?\-+:? *)?$');
+final _tablePattern = RegExp(
+    r'^[ ]{0,3}\|?([ \t]*:?\-+:?[ \t]*\|)+([ \t]|[ \t]*:?\-+:?[ \t]*)?$');
 
 /// A pattern which should never be used. It just satisfies non-nullability of
 /// pattern fields.

pkgs/markdown/test/extensions/tables.unit

diff --git a/pkgs/markdown/test/extensions/tables.unit b/pkgs/markdown/test/extensions/tables.unit
index 1a1fa11..9516fb3 100644
--- a/pkgs/markdown/test/extensions/tables.unit
+++ b/pkgs/markdown/test/extensions/tables.unit
@@ -27,6 +27,13 @@
 
 <<<
 <table><thead><tr><th>head</th><th>cells</th></tr></thead><tbody><tr><td>body</td><td>cells</td></tr></tbody></table>
+>>> rows wrapped in pipes, tabs in whitespace
+|	head	|	cells	|
+|	--	|	---	|
+|	body	|	cells	|
+
+<<<
+<table><thead><tr><th>head</th><th>cells</th></tr></thead><tbody><tr><td>body</td><td>cells</td></tr></tbody></table>
 >>> cells with inline syntax
 head `code` | _cells_
 ------------|--------
@@ -91,3 +98,9 @@
 
 <<<
 <table><thead><tr><th>Name</th><th>Character</th></tr></thead><tbody><tr><td>Pipe</td><td>| abcdef</td></tr></tbody></table>
+>>> trailing whitespace after final pipe
+| Name     | Character | 
+| ---      | ---       |	
+| Pipe     | abcdef    |
+<<<
+<table><thead><tr><th>Name</th><th>Character</th></tr></thead><tbody><tr><td>Pipe</td><td>abcdef</td></tr></tbody></table>