From 7d2c96a7788e0d70812fb1c831483d6c72b0ad12 Mon Sep 17 00:00:00 2001
From: Red Davis <me@red.to>
Date: Fri, 10 Jun 2022 17:21:35 +0100
Subject: [PATCH] Remove duplicates when propagating state (#31)

---
 RedUx/Source/Store.swift               | 3 ++-
 RedUx/Source/SwiftUI/UnwrapStore.swift | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/RedUx/Source/Store.swift b/RedUx/Source/Store.swift
index 4ab76fc..e3a579c 100644
--- a/RedUx/Source/Store.swift
+++ b/RedUx/Source/Store.swift
@@ -7,7 +7,7 @@ import SwiftUI
 /// Generally an application will have one store and then use the scope function to create sub stores for
 /// different components of the app.
 @MainActor
-public final class Store<State, Event, Environment> {    
+public final class Store<State, Event, Environment> where State: Equatable {    
     /// The state of the store.
     public private(set) var state: State {
         didSet {
@@ -153,6 +153,7 @@ extension Store {
         
         // Propagate changes to state to scoped store.
         scopedStore.parentStatePropagationTask = self.stateSequence
+            .removeDuplicates()
             .sink(priority: .high) { [weak scopedStore] in
                 scopedStore?.state = toScopedState($0)
             }
diff --git a/RedUx/Source/SwiftUI/UnwrapStore.swift b/RedUx/Source/SwiftUI/UnwrapStore.swift
index 8318878..d5e6a74 100644
--- a/RedUx/Source/SwiftUI/UnwrapStore.swift
+++ b/RedUx/Source/SwiftUI/UnwrapStore.swift
@@ -1,7 +1,8 @@
 import SwiftUI
 
 @MainActor
-public struct UnwrapStore<State, Event, Environment, Content>: View where Content: View {
+public struct UnwrapStore<State, Event, Environment, Content>: View
+where Content: View, State: Equatable {
     private let content: (Store<State?, Event, Environment>) -> Content
     private let store: Store<State?, Event, Environment>