Ian Hickson ea6bf4706a Fix the losing of state when pushing opaque routes (#5624)
Fixes https://github.com/flutter/flutter/issues/5283

Other changes in this patch:

Rename OffStage to Offstage.
Fixes https://github.com/flutter/flutter/issues/5378

Add a lot of docs.

Some minor punctuation and whitespace fixes.
2016-08-29 11:28:37 -07:00
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