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3ad9c38a46
Any requested swap interval will be saved and set on the first PumpEvents. Once PumpEvents has been called at least once, swap intervals are set immediately. This assumes that events won't be pumped until after an Emscripten main loop has been defined, and so prevents a warning on the javascript console: "emscripten_set_main_loop_timing: Cannot set timing mode for main loop since a main loop does not exist! Call emscripten_set_main_loop first to set one up." Fixes #9969.