chore: add .editorconfig

ci: Pinning third party GitHub Actions sha

.editorconfig

@@ -0,0 +1,41 @@
+# top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+# Visual Studio Spell checker configs (https://learn.microsoft.com/en-us/visualstudio/ide/text-spell-checker?view=vs-2022#how-to-customize-the-spell-checker)
+spelling_exclusion_path  = ./exclusion.dic
+
+[*.cs]
+indent_size = 4
+charset = utf-8-bom
+end_of_line = unset
+
+# Solution files
+[*.{sln,slnx}]
+end_of_line = unset
+
+# MSBuild project files
+[*.{csproj,props,targets}]
+end_of_line = unset
+
+# Xml config files
+[*.{ruleset,config,nuspec,resx,runsettings,DotSettings}]
+end_of_line = unset
+
+[*{_AssemblyInfo.cs,.notsupported.cs}]
+generated_code = true
+
+# C# code style settings
+[*.{cs}]
+dotnet_diagnostic.IDE0044.severity = none # IDE0044: Make field readonly
+
+# https://stackoverflow.com/questions/79195382/how-to-disable-fading-unused-methods-in-visual-studio-2022-17-12-0
+dotnet_diagnostic.IDE0051.severity = none # IDE0051: Remove unused private member
+dotnet_diagnostic.IDE0130.severity = none # IDE0130: Namespace does not match folder structure

.github/dependabot.yaml

@@ -5,3 +5,8 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly" # Check for updates to GitHub Actions every week
+    ignore:
+      # I just want update action when major/minor version is updated. patch updates are too noisy.
+      - dependency-name: '*'
+        update-types:
+          - version-update:semver-patch

.github/workflows/build-debug.yaml

@@ -10,10 +10,12 @@ on:
 
 jobs:
   build-dotnet:
-    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    runs-on: ubuntu-24.04
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: Cysharp/Actions/.github/actions/checkout@main
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
       - run: dotnet build -c Debug
       - run: dotnet test -c Debug --no-build

.github/workflows/build-release.yaml

@@ -14,10 +14,12 @@ on:
 
 jobs:
   build-dotnet:
-    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    runs-on: ubuntu-24.04
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: Cysharp/Actions/.github/actions/checkout@main
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
       # build and pack
       - run: dotnet build -c Release -p:Version=${{ inputs.tag }}
@@ -33,6 +35,8 @@ jobs:
   # release
   create-release:
     needs: [build-dotnet]
+    permissions:
+      contents: write
     uses: Cysharp/Actions/.github/workflows/create-release.yaml@main
     with:
       commit-id: ${{ github.sha }}

.github/workflows/prevent-github-change.yaml

@@ -7,4 +7,6 @@ on:
 
 jobs:
   detect:
+    permissions:
+      contents: read
     uses: Cysharp/Actions/.github/workflows/prevent-github-change.yaml@main

.github/workflows/stale.yaml

@@ -7,4 +7,8 @@ on:
 
 jobs:
   stale:
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
     uses: Cysharp/Actions/.github/workflows/stale-issue.yaml@main

README.md

@@ -56,7 +56,6 @@ Observable<CollectionRemoveEvent<T>> IObservableCollection<T>.ObserveRemove()
 Observable<CollectionReplaceEvent<T>> IObservableCollection<T>.ObserveReplace() 
 Observable<CollectionMoveEvent<T>> IObservableCollection<T>.ObserveMove() 
 Observable<CollectionResetEvent<T>> IObservableCollection<T>.ObserveReset()
-Observable<CollectionResetEvent<T>> IObservableCollection<T>.ObserveReset()
 Observable<Unit> IObservableCollection<T>.ObserveClear<T>()
 Observable<(int Index, int Count)> IObservableCollection<T>.ObserveReverse<T>()
 Observable<(int Index, int Count, IComparer<T>? Comparer)> IObservableCollection<T>.ObserveSort<T>()
@@ -487,7 +486,7 @@ ObservableCollections provides these collections.
 
 ```csharp
 class ObservableList<T> : IList<T>, IReadOnlyList<T>, IObservableCollection<T>, IReadOnlyObservableList<T>
-class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IReadOnlyDictionary<TKey, TValue>, IObservableCollection<KeyValuePair<TKey, TValue>> where TKey : notnull
+class ObservableDictionary<TKey, TValue> : IDictionary<TKey, TValue>, IReadOnlyDictionary<TKey, TValue>, IObservableCollection<KeyValuePair<TKey, TValue>>, IReadOnlyObservableDictionary<TKey, TValue> where TKey : notnull
 class ObservableHashSet<T> : IReadOnlySet<T>, IReadOnlyCollection<T>, IObservableCollection<T> where T : notnull
 class ObservableQueue<T> : IReadOnlyCollection<T>, IObservableCollection<T>
 class ObservableStack<T> : IReadOnlyCollection<T>, IObservableCollection<T>
@@ -684,7 +683,7 @@ public interface ISynchronizedViewList<out TView> : IReadOnlyList<TView>, IDispo
 }
 
 // Obsolete for public use
-public interface INotifyCollectionChangedSynchronizedViewList<out TView> : ISynchronizedViewList<TView>, INotifyCollectionChanged, INotifyPropertyChanged
+public interface INotifyCollectionChangedSynchronizedViewList<TView> : IList<TView>, IList, ISynchronizedViewList<TView>, INotifyCollectionChanged, INotifyPropertyChanged
 {
 }
 

src/ObservableCollections.R3/ObservableCollectionR3Extensions.cs

@@ -167,10 +167,12 @@ sealed class ObservableCollectionChanged<T>(IObservableCollection<T> collection,
                             eventArgs.Action,
                             item,
                             eventArgs.OldItem,
-                            i++,
+                            newStartingIndex: i,
                             eventArgs.OldStartingIndex,
                             eventArgs.SortOperation);
 
+                        if (eventArgs.NewStartingIndex != -1) i++;
+
                         observer.OnNext(newArgs);
                     }
                 }

src/ObservableCollections/ObservableStack.cs

@@ -166,7 +166,7 @@ namespace ObservableCollections
             }
         }
 
-        public bool TryPeek([MaybeNullWhen(false)] T result)
+        public bool TryPeek([MaybeNullWhen(false)] out T result)
         {
             lock (SyncRoot)
             {