Correct equality check on oneOf decoders for virtual DOM diffing.#32
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rupertlssmith wants to merge 1 commit intoelm:masterfrom
Open
Correct equality check on oneOf decoders for virtual DOM diffing.#32rupertlssmith wants to merge 1 commit intoelm:masterfrom
rupertlssmith wants to merge 1 commit intoelm:masterfrom
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Please merge and release this finally @evancz. The PR has been open for 5 and a half years now and people will keep wasting their time debugging unless a fix is released. |
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This fixes the equality check on oneOf decoders, and this solution will work with 0.19.1 in --optimize mode, or without --optimize.
The problem can be seen in this Ellie, the
oneOfdecoder there captures stale state from the model, as the vdom diffing fails to detect that it has changed:https://ellie-app.com/3HKzFLVbBhxa1
Fixes these issues:
#15
elm/core#904
This PR was adapted from the original PR (now closed):
elm/core#905