m.math: minor cleanup.

diff --git a/plugins/m/math.py b/plugins/m/math.py
index 6cad98c2c62961f662fb74dc297015bbacca56bd..34138528dda90a1d40945e1691c8d9789482aad0 100644 (file)
--- a/plugins/m/math.py
+++ b/plugins/m/math.py
@@ -111,8 +111,7 @@ class Math(rst.Directive):
         node = nodes.raw(self.block_text, latex2svgextra.patch(content, svg, None, ''), format='html')
         node.line = self.content_offset + 1
         self.add_name(node)
-        container = nodes.container(**self.options)
-        container['classes'] += ['m-math']
+        container = nodes.container(classes=['m-math'] + classes, **self.options)
         container.append(node)
         return [container]