maintain context for component events

src/generators/nodes/Component.ts

@@ -339,6 +339,7 @@ export default class Component extends Node {
 		this.handlers.forEach(handler => {
 			handler.var = block.getUniqueName(`${this.var}_${handler.name}`); // TODO this is hacky
 			handler.render(compiler, block);
+			if (handler.usesContext) block.maintainContext = true; // TODO is there a better place to put this?
 		});
 
 		if (this.name === 'svelte:component') {