Whitespace following <:Window/>

[Rich-Harris]

Fairly minor issue, but whereas this code...

<!-- a comment -->

<p>whitespace before this element is ignored</p>

...is compiled to this...

function create_main_fragment(state, component) {
  var p;

  return {
    c: function create() {
      p = createElement("p");
      p.textContent = "whitespace before this element is ignored";
    },

    m: function mount(target, anchor) {
      insertNode(p, target, anchor);
    },

    p: noop,

    u: function unmount() {
      detachNode(p);
    },

    d: noop
  };
}

...this code...

<:Window bind:scrollX/>

<p>whitespace before this element is NOT ignored</p>

...is compiled to this:

function create_main_fragment(state, component) {
  var window_updating = false, text, p;

  function onwindowscroll(event) {
    window_updating = true;

    component.set({
      scrollX: this.scrollX
    });
    window_updating = false;
  };
  window.addEventListener("scroll", onwindowscroll);

  component.observe("scrollX", function(x) {
    if (window_updating) return;
    window.scrollTo(x, window.scrollY);
  });

  return {
    c: function create() {
      text = createText("\n\n");
      p = createElement("p");
      p.textContent = "whitespace before this element is NOT ignored";
    },

    m: function mount(target, anchor) {
      insertNode(text, target, anchor);
      insertNode(p, target, anchor);
    },

    p: noop,

    u: function unmount() {
      detachNode(text);
      detachNode(p);
    },

    d: function destroy() {
      window.removeEventListener("scroll", onwindowscroll);
    }
  };
}

Note the text = createText("\n\n");, which also has to be mounted and detached etc.