Extend lifetime of layers from GroupLayer::get_layer

CHANGELOG.md

@@ -5,6 +5,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+## Changed
+- Extend lifetime of `Layer`s returned from `GroupLayer::get_layer` to the map's.
+
 ## [0.12.0]
 ### Added
 - Add `text`, `width` and `height` members to `ObjectShape::Text`. (#278)

src/layers/group.rs

@@ -129,7 +129,7 @@ impl<'map> GroupLayer<'map> {
             .map(move |layer| Layer::new(map, layer))
     }
     /// Gets a specific layer from the group by index.
-    pub fn get_layer(&self, index: usize) -> Option<Layer> {
+    pub fn get_layer(&self, index: usize) -> Option<Layer<'map>> {
         self.data
             .layers
             .get(index)