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For widget event handlers, we register a single listener on the `<body>`, and then notify the relavent widget (if any) when the event fires. `touchstart` and `touchmove` events are particularly performance sensitive because they block scrolling on mobile. Therefore we want to avoid registering global non-passive listeners for these events. This commit updates the WidgetTouchStartHook and WidgetDragHook implementations to automatically register listeners on the specific widget DOM elements when required. This commit removes the last global scroll-blocking event handler from Discourse core. That means that mobile scrolling is now completely decoupled from our JS app. Even if the JS app is completely blocked (e.g. during rendering), scrolling will now continue to work. This should make things feel a lot smoother, especially on lower performance devices. |
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