[ios, macos] Fix MGLSymbolStyleLayer.text localization issue. (#14405)

Fixed an MGLSymbolStyleLayer.text localization bug caused by the introduction of MGLAttributedExpression object. The localization parsing was ignoring the latter.

* [ios, macos] Fix a localization issue.

* [ios, macos] Add formating expressions localization test.

* [ios, macos] Update MGLSymbolStyleLayer.text documentation.

1 files changed, 6 insertions, 0 deletions

diff --git a/platform/darwin/src/NSExpression+MGLAdditions.mm b/platform/darwin/src/NSExpression+MGLAdditions.mm
index 4b1fdb818e..9dad00e56e 100644
--- a/platform/darwin/src/NSExpression+MGLAdditions.mm
+++ b/platform/darwin/src/NSExpression+MGLAdditions.mm
@@ -1471,6 +1471,12 @@ NSDictionary<NSNumber *, NSExpression *> *MGLLocalizedStopDictionary(NSDictionar
                 if (localizedValues != self.constantValue) {
                     return [NSExpression expressionForConstantValue:localizedValues];
                 }
+            } else if ([self.constantValue isKindOfClass:[MGLAttributedExpression class]]) {
+                MGLAttributedExpression *attributedExpression = (MGLAttributedExpression *)self.constantValue;
+                NSExpression *localizedExpression = [attributedExpression.expression mgl_expressionLocalizedIntoLocale:locale];
+                MGLAttributedExpression *localizedAttributedExpression = [MGLAttributedExpression attributedExpression:localizedExpression attributes:attributedExpression.attributes];
+                
+                return [NSExpression expressionForConstantValue:localizedAttributedExpression];
             }
             return self;
         }