Patrick Brosset c109f6e2ed Bug 1374587 - Avoid getting NodeActors for grids when we already know them and filter reflows; r=gl
Here we make updates on reflow slower (with a throttle) cause we don't
really need to update live.
We also filter all reflows that do not cause either the list of grids or
the current outline to change.
Finally, we also attach NodeActors to GridActor forms (when they are know)
in order to avoid one more round-trip to the server.

Globally, this makes performance of the grid panel far better on pages that
cause many reflows.

Note that this commit also fixes a debounce vs. throttle confusion that
existed in an inspector utils file. The throttle function there was actually
a debounce function, so it was renamed, and an actual throttle function
was added.

MozReview-Commit-ID: GeqgZR0o0E6

--HG--
extra : rebase_source : 6b9719379dcbd4479bded26014aa3742bd75208e
2017-06-27 12:02:53 -07:00

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