Don't linewrap css in svg header.

anntzer · anntzer · commit ec91829f3cd2 · 2020-06-18T15:47:51.000+02:00
Output the tiny bit of CSS in every SVG header as
```xml
  &lt;style type="text/css"&gt;*{stroke-linecap:butt;stroke-linejoin:round;}&lt;/style&gt;
```
instead of the slightly weirdly indented
```
  &lt;style type="text/css"&gt;
*{stroke-linecap:butt;stroke-linejoin:round;}
  &lt;/style&gt;
```
diff --git a/lib/matplotlib/backends/backend_svg.py b/lib/matplotlib/backends/backend_svg.py
@@ -430,9 +430,7 @@ def _write_default_style(self):
             'stroke-linejoin': 'round',
             'stroke-linecap': 'butt'})
         writer.start('defs')
-        writer.start('style', type='text/css')
-        writer.data('*{%s}\n' % default_style)
-        writer.end('style')
+        writer.element('style', type='text/css', text='*{%s}' % default_style)
         writer.end('defs')
 
     def _make_id(self, type, content):
