only overwrite this in event handlers for custom events - fixes #1390

src/compile/nodes/EventHandler.ts

@@ -77,16 +77,18 @@ export default class EventHandler extends Node {
 			}
 		}
 
-		this.args.forEach(arg => {
-			arg.overwriteThis(this.parent.var);
-		});
-
-		if (this.isCustomEvent && this.callee && this.callee.name === 'this') {
-			const node = this.callee.nodes[0];
-			compiler.code.overwrite(node.start, node.end, this.parent.var, {
-				storeName: true,
-				contentOnly: true
+		if (this.isCustomEvent) {
+			this.args.forEach(arg => {
+				arg.overwriteThis(this.parent.var);
 			});
+
+			if (this.callee && this.callee.name === 'this') {
+				const node = this.callee.nodes[0];
+				compiler.code.overwrite(node.start, node.end, this.parent.var, {
+					storeName: true,
+					contentOnly: true
+				});
+			}
 		}
 	}
 }

test/runtime/samples/event-handler-each-this/_config.js

@@ -0,0 +1,28 @@
+export default {
+	data: {
+		items: ['foo', 'bar', 'baz'],
+	},
+
+	html: `
+		<button>foo</button>
+		<button>bar</button>
+		<button>baz</button>
+	`,
+
+	test(assert, component, target, window) {
+		const buttons = target.querySelectorAll('button');
+		const event = new window.MouseEvent('click');
+
+		const clicked = [];
+
+		component.on('clicked', event => {
+			clicked.push(event.node);
+		});
+
+		buttons[1].dispatchEvent(event);
+
+		assert.equal(clicked.length, 1);
+		assert.equal(clicked[0].nodeName, 'BUTTON');
+		assert.equal(clicked[0].textContent, 'bar');
+	}
+};

test/runtime/samples/event-handler-each-this/main.html

@@ -0,0 +1,3 @@
+{#each items as item}
+	<button on:click='fire("clicked", { node: this })'>{item}</button>
+{/each}