feat: OpenInNewTabAction for the action trigger framework#24431
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Replace appendStatement(JsBuilder, StringBuilder) on Action with render(JsBuilder): JsFunction. Replace Input.appendExpression with Input.toJs(JsBuilder): JsFunction returning the input's value when invoked. Each Action ships as its own JsFunction (body + captures); Trigger composes them as captures of a tiny parent JsFunction whose body is just $0(event);$1(event);... PromiseAction wraps the subclass JsFunction with OBSERVE_PROMISE via captures instead of string concatenation. Eliminates hand-escaped JS literals in action bodies — strings and Element refs go through JsFunction's capture mechanism, which Jackson- encodes on the wire. Removes the "this" special-case for the host element: the host is captured the same way as any other Element. JsBuilder shrinks to just the render-time context (trigger() accessor) plus a static json() helper kept for Trigger.installJs() (a raw String, not a JsFunction).
Starts a file download in the browser when a trigger fires, using a synthesised <a href download> click inside the gesture. Three flavours: a static URL (optionally with a filename), a DownloadHandler whose stream resource is wired through Element.setAttribute (same lifecycle as Image.setSrc / Anchor.setHref), and an Action.Input<String> for URLs resolved on the client at fire time. No outcome callback — browsers do not report download completion.
Opens a URL in a new browser tab/window via window.open(url, "_blank", features) when the bound trigger fires. Four constructors cover static URL with default features (noopener,noreferrer), static URL with custom features, Action.Input<String> URL resolved on the client at fire time, and the same with a client-resolved features string. No outcome callback — browsers don't reliably report popup-blocked or tab-closed.
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Opens a URL in a new browser tab/window via window.open(url, "_blank",
features) when the bound trigger fires. Four constructors cover static
URL with default features (noopener,noreferrer), static URL with custom
features, Action.Input URL resolved on the client at fire time,
and the same with a client-resolved features string. No outcome
callback — browsers don't reliably report popup-blocked or tab-closed.