c63aefd28b
Having 2 or more platform views simultaneously in the layer tree was crashing immediately on iOS with GL backend. This regressed in #11070 which passed gl_context to a function in a loop using std::move (which meant on the second iteration the caller is no longer the owner of the field). I added a scenarios_app test, though this test doesn't run on a physical device on CI so it would have only caught the problem when running locally (flutter/flutter#43852).
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