Support text writer

Author: TLouf

sphinx/writers/text.py

@@ -600,8 +600,15 @@ def visit_desc_parameterlist(self, node: Element) -> None:
     def depart_desc_parameterlist(self, node: Element) -> None:
         self.add_text(')')
 
+    def visit_desc_parameterline(self, node: Element) -> None:
+        self.new_state()
+
+    def depart_desc_parameterline(self, node: Element) -> None:
+        self.add_text(',')
+        self.end_state(wrap=False, end=None)
+
     def visit_desc_parameter(self, node: Element) -> None:
-        if not self.first_param:
+        if not self.first_param and not node.parent.parent.get('is_multiline'):
             self.add_text(', ')
         else:
             self.first_param = 0