Added CoatMux.Layer::getControl()

Author: nedtwigg

CHANGES.md

@@ -1,6 +1,8 @@
 # DurianSwt releases
 
 ## [Unreleased]
+### Added
+- `CoatMux.Layer` now exposes its root `Control` instance ([#12](https://github.com/diffplug/durian-swt/issues/12)).
 ### Removed
 - **BREAKING** Removed `ColorPool.getSystemColor()` ([#8](https://github.com/diffplug/durian-swt/issues/8)).
 - **BREAKING** Switched type arguments of `TypedDataField` ([#3](https://github.com/diffplug/durian-swt/issues/3)).

durian-swt/src/main/java/com/diffplug/common/swt/CoatMux.java

@@ -82,6 +82,9 @@ public RxGetter<Boolean> rxOnTop() {
 			return currentLayer.map(opt -> opt.isPresent() && opt.get() == this);
 		}
 
+		/** The control at the root of this layer. */
+		public Control getControl() { return control; }
+
 		/** The handle which was returned by the {@link Coat.Returning}. */
 		public T getHandle() {
 			return handle;