[librsvg: 1/7] Oops, parse "transform: none" as well as lists of transform functions

[Marge Bot <marge-bot src gnome org>]

commit 6a68c9a79c0e290363b2fa7605fd6fbd49bad6e8
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Aug 31 17:46:59 2021 -0500

    Oops, parse "transform: none" as well as lists of transform functions
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/582>

 src/transform.rs | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)
---
diff --git a/src/transform.rs b/src/transform.rs
index a0c8a571..80bae8f6 100644
--- a/src/transform.rs
+++ b/src/transform.rs
@@ -90,9 +90,16 @@ pub enum TransformFunction {
 
 impl Parse for TransformProperty {
     fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<TransformProperty, ParseError<'i>> {
-        let t = parse_transform_prop_function_list(parser)?;
+        if parser
+            .try_parse(|p| p.expect_ident_matching("none"))
+            .is_ok()
+        {
+            Ok(TransformProperty::None)
+        } else {
+            let t = parse_transform_prop_function_list(parser)?;
 
-        Ok(TransformProperty::List(t))
+            Ok(TransformProperty::List(t))
+        }
     }
 }
 
@@ -877,6 +884,14 @@ mod tests {
         assert_transform_eq(&parse_transform("").unwrap(), &Transform::identity());
     }
 
+    #[test]
+    fn test_parse_transform_property_none() {
+        assert_eq!(
+            parse_transform_prop("none").unwrap(),
+            TransformProperty::None
+        );
+    }
+
     #[test]
     fn test_parse_transform_property_matrix() {
         let tp = TransformProperty::List(vec![TransformFunction::Matrix(