[FIX] base: support tail text after a comment

This commit fixes the case where you have some text after a comment.
Until know, we miss it. Now we render the tail part.

```
<t>
        <!-- HIDE Text 1 -->
        Text 1
        <p>SHOW Text 2</p>
</t>
```

After the fix, Text 1 is correctly rendered

This commit fixes #76628

closes odoo/odoo#78782

X-original-commit: 566360b07b4ff6c7290f264d9064400df2b06ca5
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

odoo/addons/base/models/qweb.py

@@ -939,10 +939,9 @@ class QWeb(object):
         body = []
         if el.getchildren():
             for item in el:
-                # ignore comments & processing instructions
-                if isinstance(item, etree._Comment):
-                    continue
-                body.extend(self._compile_node(item, options, indent))
+                if not isinstance(item, etree._Comment):
+                    body.extend(self._compile_node(item, options, indent))
+                # comments can also contains tail text
                 if item.tail is not None:
                     self._appendText(item.tail, options)
         return body

odoo/addons/base/tests/test_qweb.py

@@ -5,6 +5,7 @@ import collections
 import json
 import os.path
 import re
+import markupsafe
 
 from lxml import etree, html
 from lxml.builder import E
@@ -1262,3 +1263,26 @@ class TestEmptyLines(TransactionCase):
         self.assertTrue(re.compile('^\s+\n').match(rendered))
         self.assertTrue(re.compile('\n\s+\n').match(rendered))
 
+
+class TestQWebMisc(TransactionCase):
+    def test_render_comment_tail(self):
+        """ Test the rendering of a tail text, near a comment.
+        """
+
+        view1 = self.env['ir.ui.view'].create({
+            'name': "dummy",
+            'type': "qweb",
+            'arch': """
+            <t>
+                <!-- it is a comment -->
+                <!-- it is another comment -->
+                Text 1
+                <!-- it is still another comment -->
+                Text 2
+                <t>ok</t>
+            </t>
+            """
+        })
+        emptyline = '\n                '
+        expected = markupsafe.Markup('Text 1' + emptyline + 'Text 2' + emptyline + 'ok')
+        self.assertEqual(view1._render(), expected)