Call renderer when first opened

[samiheikki]

Fixes #108

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This change is 

[tomivirkki]

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test/vaadin-dialog_renderer-test.html, line 61 at r1 (raw file):

      });

      it('should not render the content of renderer function if the dialog is not opened', () => {

For me, this test is passing even with the current master

[tomivirkki]

a discussion (no related file):
I think the problem is on the vaadin-overlay level and should be fixed there.

So the right fix would be to add "opened" in the list of observer method dependencies here: https://github.com/vaadin/vaadin-overlay/blob/master/src/vaadin-overlay.html#L348

...and then invoking "render()" https://github.com/vaadin/vaadin-overlay/blob/master/src/vaadin-overlay.html#L818 only when the overlay is opened (for the first time).

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[samiheikki]

Reviewable status: 0 of 2 files reviewed, 2 unresolved discussions (waiting on @samiheikki)

a discussion (no related file):

Previously, tomivirkki (Tomi Virkki) wrote…

I think the problem is on the vaadin-overlay level and should be fixed there.

So the right fix would be to add "opened" in the list of observer method dependencies here: https://github.com/vaadin/vaadin-overlay/blob/master/src/vaadin-overlay.html#L348

...and then invoking "render()" https://github.com/vaadin/vaadin-overlay/blob/master/src/vaadin-overlay.html#L818 only when the overlay is opened (for the first time).

Created vaadin/vaadin-overlay#120

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