TextInput view: UI does not react when updating buffer value to previous value entered

[sexnine]

When the signal that serves as the value for a TextInput is updated, if the value it was last set to by method of user input is the same, the UI does not react.

This is due to TextInput.buffer.last_buffer only being set on user input and an optimization where request_layout is not called when the last buffer and the current buffer are the same:

floem/src/views/text_input.rs

Lines 1044 to 1060 in 4bf974c

	fn update(&mut self, cx: &mut UpdateCx, state: Box<dyn Any>) {
	if let Ok(state) = state.downcast::<(String, bool)>() {
	let (value, is_focused) = *state;
	// Only update recomputation if the state has actually changed
	if self.is_focused != is_focused || value != self.buffer.last_buffer {
	if is_focused && !cx.app_state.is_active(&self.id) {
	self.selection = None;
	self.cursor_glyph_idx = self.buffer.with_untracked(|buf| buf.len());
	}
	self.is_focused = is_focused;
	self.id.request_layout();
	}
	} else {
	eprintln!("downcast failed");
	}
	}

My use case for this is listening to arrow key up/down events and increasing the value in the TextInput accordingly. As a temporary fix, I am calling request_layout myself in that event handler when I update the value.

Demo of issue with my use case:

upnp_3cHDqTShhs.mp4