Changelog for reflex-0.8.1.0

Revision history for reflex

Replace 0.7.2.0 with 0.8.0.0 to reflect the MonadHold interface change. Deprecates 0.7.2.0.

(#413, #417) Add Reflex.Host.Headless module which provides runHeadlessApp as an easy way to run a Reflex network in a "headless" environment.
(#420) Add a Data.Zip.Unzip instance for Event.
(#419) Add distributeIntMapOverDynPure and joinDynThroughIntMap as convenience functions for working with Dynamic IntMaps.

Add lifting instances for most classes to Reflex.Profiled.Profiled. (#398)
Class MonadQuery t q m now has a Monad m superclass constraint. (#400)
(Breaking change) Rename class MonadBehaviorWriter -> BehaviorWriter for consistency with EventWriter/DynamicWriter. (#401)
Introduce deprecated alias MonadBehaviorWriter = BehaviorWriter. (#401)
Fix bug in spider where event subscriptions would be prematurely finalized due to over-aggressive inlining. (#409)
Add instances of PerformEvent and TriggerEvent for MaybeT. (#395)

Fix a bug in the Reflex Profiled transformer where Reflex.Class.mergeIncrementalG and Reflex.Class.mergeIncrementalWithMoveG implementations referenced itself instead of the inner transformed timeline, causing an infinite loop.

Support GHC 8.8
Add Reflex.Query.Base.mapQueryT. See that module for documentation
The Reflex.Patch.* modules were moved to the patch library. They are Data.Patch.* there, but reexported under their old names for backwards compatability here.
Additional instances for Query classes for basic types.
Add cabal flags debug-propagation and debug-event-cycles to build in debugging code for performance and for cyclic dependencies between events

Data.WeakBag.traverse and Data.FastWeakBag.traverse have been deprecated. They are replaced with Data.WeakBag.traverse_ and Data.FastWeakBag.traverse_, respectively.
Fixes a bug in Reflex.Patch.MapWithMove.patchThatSortsMapWith that was producing invalid PatchMapWithMove.
Add missing NotReady instances:
- instance NotReady (SpiderTimeline x) (SpiderHost x)
- instance HasSpiderTimeline x => NotReady (SpiderTimeline x) (PerformEventT (SpiderTimeline x) (SpiderHost x))

Support these >= 1. Add split-these flag to control whether to use new these/semialign combination or not.
Update version bounds to fix some CI failures
Add travis CI configuration

Generalize fan to fanG to take a DMap with non-Identity functor:
- fan to fanG
- EventSelectorG for fanG result selector.
Reduce the amount of unsafeCoerce in coercing newtypes under Event/Dynamic/Behavior.
- Add fused ReaderIO for the purpose of coercion (ReaderT's third argument has nominal role preventing automated coerce)
- Add incrementalCoercion/coerceIncremental to go with dynamicCoercion/coerceDynamic
Generalize merging functions: merge to mergeG, mergeIncremental to mergeIncrementalG, mergeIncrementalWithMove to mergeIncrementalWithMoveG.
Generalize distribute function: distributeDMapOverDynPure to distributeDMapOverDynPureG,

Fix holdDyn so that it is lazy in its event argument These produce DMaps whose values needn't be Identity.
Stop using the now-deprecated *Tag classes (e.g., ShowTag).
Fix holdDyn so that it is lazy in its event argument.

Deprecate FunctorMaybe in favor of Data.Witherable.Filterable. We still export fmapMaybe, ffilter, etc., but they all rely on Filterable now.
Rename MonadDynamicWriter to DynamicWriter and add a deprecation for the old name.
Remove many deprecated functions.
Add a Num instance for Dynamic.
Add matchRequestsWithResponses to make it easier to use Requester with protocols that don't do this matching for you.
Add withRequesterT to map functions over the request and response of a RequesterT.
Suppress nil patches in QueryT as an optimization. The Query type must now have an Eq instance.
Add throttleBatchWithLag to Reflex.Time. See that module for details.