Merge pull request #12565 from sebakerckhof/fix/12564

Handle named colors as string in equal operator

src/ol/style/expressions.js

@@ -606,6 +606,10 @@ function getEqualOperator(operator) {
         );
       }
 
+      // Since it's not possible to have color types here, we can leave it out
+      // This fixes issues in case the value type is ambiguously detected as a color (e.g. the string 'red')
+      type = type ^ ValueTypes.COLOR;
+
       return `(${expressionToGlsl(
         context,
         args[0],

test/browser/spec/ol/style/expressions.test.js

@@ -250,6 +250,9 @@ describe('ol.style.expressions', function () {
       expect(expressionToGlsl(context, ['==', 10, ['get', 'attr4']])).to.eql(
         '(10.0 == a_attr4)'
       );
+      expect(expressionToGlsl(context, ['==', 'red', ['get', 'attr4']])).to.eql(
+        `(${stringToGlsl(context, 'red')} == a_attr4)`
+      );
       expect(expressionToGlsl(context, ['!=', 10, ['get', 'attr4']])).to.eql(
         '(10.0 != a_attr4)'
       );