Find/Replace Overlay: close when escape is pressed in the editor

When escape is pressed inside of the editor which is targeted by the
find/replace overlay, the overlay now closes.

fixes #2033

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/overlay/FindReplaceOverlay.java

@@ -302,6 +302,11 @@ private void focusTargetWidget() {
 			targetWidget.forceFocus();
 		}
 	};
+	private KeyListener closeOnTargetEscapeListener = KeyListener.keyPressedAdapter(c -> {
+		if (c.keyCode == SWT.ESC) {
+			this.close();
+		}
+	});
 
 	private boolean isPartCurrentlyDisplayedInPartSash() {
 		IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
@@ -409,6 +414,7 @@ private void unbindListeners() {
 			if (targetWidget != null) {
 				targetWidget.getShell().removeControlListener(shellMovementListener);
 				targetWidget.removePaintListener(widgetMovementListener);
+				targetWidget.removeKeyListener(closeOnTargetEscapeListener);
 				targetPart.getSite().getPage().removePartListener(partListener);
 			}
 		}
@@ -421,6 +427,7 @@ private void bindListeners() {
 
 			targetWidget.getShell().addControlListener(shellMovementListener);
 			targetWidget.addPaintListener(widgetMovementListener);
+			targetWidget.addKeyListener(closeOnTargetEscapeListener);
 			targetPart.getSite().getPage().addPartListener(partListener);
 		}
 	}