Optimization of PluginInstallerWindow

Refactored repository selection logic. Reduced code duplication and improving maintainability. Added caching for third-party repo list to avoid unnecessary rebuilds. Updated repo filter logic to use normalized URLs for more reliable matching.

Dalamud/Interface/Internal/Windows/PluginInstaller/PluginInstallerWindow.cs

@@ -127,10 +127,25 @@ internal class PluginInstallerWindow : Window, IDisposable
     private bool adaptiveSort = true;
 
     private string? selectedRepoUrl = null; // null = All Repositories
-    private List<string> cachedRepoUrls = new();
+    private string selectedRepoUrlNormalized = string.Empty;
-    private HashSet<string> cachedRepoUrlsNormalized = new(StringComparer.OrdinalIgnoreCase);
+    private int repoFilterCacheKey = 0;
+
+    private readonly List<string> cachedRepoUrls = new();
+    private readonly HashSet<string> cachedRepoUrlsNormalized = new(StringComparer.OrdinalIgnoreCase);
     private const string XivLauncherRepoKey = "XIVLauncher";
 
+    private void SetSelectedRepo(string? repoUrl)
+    {
+        if (this.selectedRepoUrl == repoUrl)
+            return;
+
+        this.selectedRepoUrl = repoUrl;
+        this.selectedRepoUrlNormalized = NormalizeRepoUrl(repoUrl);
+
+        this.UpdateCategoriesOnPluginsChange();
+        this.openPluginCollapsibles.Clear();
+    }
+
 private OperationStatus installStatus = OperationStatus.Idle;
     private OperationStatus updateStatus = OperationStatus.Idle;
 
@@ -817,16 +832,12 @@ internal class PluginInstallerWindow : Window, IDisposable
             {
                 if (ImGui.Selectable("All Repositories", this.selectedRepoUrl == null))
                 {
-                    this.selectedRepoUrl = null;
+                    this.SetSelectedRepo(null);
-                    this.UpdateCategoriesOnPluginsChange();
-                    this.openPluginCollapsibles.Clear();
 }
 
                 if (ImGui.Selectable("XIVLauncher", this.selectedRepoUrl == XivLauncherRepoKey))
                 {
-                    this.selectedRepoUrl = XivLauncherRepoKey;
+                    this.SetSelectedRepo(XivLauncherRepoKey);
-                    this.UpdateCategoriesOnPluginsChange();
-                    this.openPluginCollapsibles.Clear();
 }
 
                 ImGui.Separator();
@@ -839,9 +850,7 @@ internal class PluginInstallerWindow : Window, IDisposable
                     // Use stable unique IDs to avoid ImGui collisions with long/duplicate URLs.
                     if (ImGui.Selectable($"{repoUrl}##repo_{i}", selected))
                     {
-                        this.selectedRepoUrl = repoUrl;
+                        this.SetSelectedRepo(repoUrl);
-                        this.UpdateCategoriesOnPluginsChange();
-                        this.openPluginCollapsibles.Clear();
 }
                 }
 
@@ -4067,6 +4076,24 @@ internal class PluginInstallerWindow : Window, IDisposable
     {
         var config = Service<DalamudConfiguration>.Get();
 
+        // Avoid rebuilding every frame unless the repo list actually changed.
+        var newKey = 17;
+        unchecked
+        {
+            foreach (var repo in config.ThirdRepoList)
+            {
+                if (string.IsNullOrWhiteSpace(repo.Url))
+                    continue;
+
+                newKey = (newKey * 31) + StringComparer.OrdinalIgnoreCase.GetHashCode(repo.Url.Trim());
+            }
+        }
+
+        if (newKey == this.repoFilterCacheKey)
+            return;
+
+        this.repoFilterCacheKey = newKey;
+
 this.cachedRepoUrls.Clear();
         this.cachedRepoUrlsNormalized.Clear();
 
@@ -4168,10 +4195,10 @@ internal class PluginInstallerWindow : Window, IDisposable
                 return true;
 
             // Anything not matching the configured third-party repos is considered "XIVLauncher".
-            return !this.cachedRepoUrlsNormalized.Any(u => RepoUrlMatches(u, normalized) || string.Equals(u, normalized, StringComparison.OrdinalIgnoreCase));
+            return !this.cachedRepoUrlsNormalized.Contains(normalized);
         }
 
-        return RepoUrlMatches(repoUrl, this.selectedRepoUrl);
+        return RepoUrlMatches(repoUrl, this.selectedRepoUrlNormalized);
     }
 
     private bool PassesRepoFilter(RemotePluginManifest manifest) => this.PassesRepoFilter(GetRepoFilterUrl(manifest));