Handle All correctly

Author: Manishearth

src/mixed_script.rs

@@ -22,7 +22,9 @@ impl From<ScriptExtension> for AugmentedScriptSet {
         let mut jpan = false;
         let mut kore = false;
 
-        if ext.contains_script(Script::Han) {
+        if ext == ScriptExtension::Single(Script::Common) ||
+           ext == ScriptExtension::Single(Script::Inherited) ||
+           ext.contains_script(Script::Han) {
             hanb = true;
             jpan = true;
             kore = true;
@@ -84,6 +86,12 @@ impl AugmentedScriptSet {
         self.base.is_empty() && ! self.hanb && !self.jpan && !self.kore
     }
 
+    /// Check if the set is "All" (Common or Inherited)
+    pub fn is_all(&self) -> bool {
+        self.base == ScriptExtension::Single(Script::Common) ||
+        self.base == ScriptExtension::Single(Script::Inherited)
+    }
+
     /// Construct an AugmentedScriptSet for a given character
     pub fn for_char(c: char) -> Self {
         ScriptExtension::from(c).into()