fixed second swiftinterface page won't response

* fixed second swiftinterface page won't response
* fixed tap the same name of swiftinterface, it would open another swiftinterface with same content

Author: Wang Lun

Sources/SourceKitLSP/SourceKitLSPServer.swift

@@ -2065,9 +2065,36 @@ extension SourceKitLSPServer {
     originatorUri: DocumentURI,
     languageService: LanguageService
   ) async throws -> Location {
+    // Check if we're already in the target interface with the same module/group/symbol
+    if let referenceDoc = try? ReferenceDocumentURL(from: originatorUri),
+       case .generatedInterface(let interfaceData) = referenceDoc,
+       interfaceData.moduleName == moduleName && interfaceData.groupName == groupName {
+      
+      // If we have a specific symbol USR, try to find its position in the current interface
+      if let symbolUSR = symbolUSR,
+         let swiftLanguageService = languageService as? SwiftLanguageService {
+        do {
+          let position = try await swiftLanguageService.generatedInterfaceManager.position(
+            ofUsr: symbolUSR, 
+            in: interfaceData
+          )
+          return Location(uri: originatorUri, range: Range(position))
+        } catch {
+          // If we can't find the symbol, just return the top of the current interface
+          return Location(uri: originatorUri, range: Range(Position(line: 0, utf16index: 0)))
+        }
+      } else {
+        // No specific symbol, just return the current interface location
+        return Location(uri: originatorUri, range: Range(Position(line: 0, utf16index: 0)))
+      }
+    }
+    
+    // If the originator URI is already a generated interface, use its primary file for build settings
+    let documentForBuildSettings = originatorUri.primaryFile ?? originatorUri
+    
     guard
       let interfaceDetails = try await languageService.openGeneratedInterface(
-        document: originatorUri,
+        document: documentForBuildSettings,
         moduleName: moduleName,
         groupName: groupName,
         symbolUSR: symbolUSR

Sources/SourceKitLSP/Swift/GeneratedInterfaceManager.swift

@@ -92,7 +92,13 @@ actor GeneratedInterfaceManager {
     incrementingRefCount: Bool
   ) async throws -> OpenGeneratedInterfaceDocumentDetails {
     func loadFromCache() -> OpenGeneratedInterfaceDocumentDetails? {
-      guard let cachedIndex = openInterfaces.firstIndex(where: { $0.url == document }) else {
+      // Cache by module name and group name, not the full document data
+      // This allows reuse across different buildSettingsFrom URIs
+      guard let cachedIndex = openInterfaces.firstIndex(where: { 
+        $0.url.moduleName == document.moduleName && 
+        $0.url.groupName == document.groupName &&
+        $0.url.sourcekitdDocumentName == document.sourcekitdDocumentName
+      }) else {
         return nil
       }
       if incrementingRefCount {
@@ -160,7 +166,11 @@ actor GeneratedInterfaceManager {
   }
 
   private func decrementRefCount(for document: GeneratedInterfaceDocumentURLData) {
-    guard let cachedIndex = openInterfaces.firstIndex(where: { $0.url == document }) else {
+    guard let cachedIndex = openInterfaces.firstIndex(where: { 
+      $0.url.moduleName == document.moduleName && 
+      $0.url.groupName == document.groupName &&
+      $0.url.sourcekitdDocumentName == document.sourcekitdDocumentName
+    }) else {
       logger.fault(
         "Generated interface document for \(document.moduleName) is not open anymore. Unbalanced retain and releases?"
       )

Sources/SourceKitLSP/Swift/OpenInterface.swift

@@ -21,10 +21,18 @@ extension SwiftLanguageService {
     groupName: String?,
     symbolUSR symbol: String?
   ) async throws -> GeneratedInterfaceDetails? {
+    // Generate a deterministic document name based on module name and group name
+    // This ensures we reuse the same interface for the same module/group combination
+    let documentName = if let groupName {
+      "\(moduleName)-\(groupName.replacingOccurrences(of: "/", with: "-"))"
+    } else {
+      moduleName
+    }
+    
     let urlData = GeneratedInterfaceDocumentURLData(
       moduleName: moduleName,
       groupName: groupName,
-      sourcekitdDocumentName: "\(moduleName)-\(UUID())",
+      sourcekitdDocumentName: documentName,
       primaryFile: document
     )
     let position: Position? =

Sources/SourceKitLSP/Workspace.swift

@@ -432,11 +432,12 @@ package final class Workspace: Sendable, BuildServerManagerDelegate {
   /// document is returned.
   func setDocumentService(for uri: DocumentURI, _ newLanguageService: any LanguageService) -> LanguageService {
     return documentService.withLock { service in
-      if let languageService = service[uri] {
+      let key = uri.buildSettingsFile
+      if let languageService = service[key] {
         return languageService
       }
 
-      service[uri] = newLanguageService
+      service[key] = newLanguageService
       return newLanguageService
     }
   }