Implement revamped `RedrawRequested` on iOS.#1299

Merged

goddessfreya merged 6 commits intorust-windowing:redraw-requested-2.0from simlay:redraw-requested-2.0

Dec 22, 2019

+17-17

Commits on Dec 1, 2019

Implement revamped RedrawRequested on iOS
simlay
committed

Commits on Dec 2, 2019

Added RedrawEventsCleared to events_cleared logic
simlay
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Commits on Dec 3, 2019

Fixed from comments
simlay
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Commits on Dec 13, 2019

Added RedrawEventsCleared to draw_rect handler.
simlay
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Commits on Dec 18, 2019

Fixed out of order RedrawEventsCleared events.
simlay
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Commits on Dec 21, 2019

cargo fmt
simlay
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