Retain picker cache ownership on native PM rejection

tools/chatgui-android/app/src/main/java/com/utun/chat/data/NativeLib.kt

@@ -186,7 +186,7 @@ object NativeLib {
     fun dmSend(convId: String, text: String) { nativeDmSend(convId, text) }
     fun dmRequestConversations() { nativeDmRequestConversations() }
     fun dmRequestMessages(convId: String) { nativeDmRequestMessages(convId) }
-    fun dmSendFile(convId: String, path: String, name: String) { nativeDmSendFile(convId, path, name) }
+    fun dmSendFile(convId: String, path: String, name: String): Boolean = nativeDmSendFile(convId, path, name)
 
     private external fun nativeInit(dbPath: String, controlPort: Int, config: Any, logCb: Any): Boolean
     private external fun nativeStart(configText: String): Boolean
@@ -299,5 +299,5 @@ object NativeLib {
     private external fun nativeDmSend(convId: String, text: String)
     private external fun nativeDmRequestConversations()
     private external fun nativeDmRequestMessages(convId: String)
-    private external fun nativeDmSendFile(convId: String, path: String, name: String)
+    private external fun nativeDmSendFile(convId: String, path: String, name: String): Boolean
 }

tools/chatgui-android/app/src/main/java/com/utun/chat/viewmodel/ChatViewModel.kt

@@ -1025,7 +1025,10 @@ class ChatViewModel : ViewModel() {
 
     fun sendAttachment(filePath: String, target: ConversationTarget, name: String = File(filePath).name) {
         val r = repo ?: throw IllegalStateException("Сервис чата остановлен")
-        if (target is ConversationTarget.Pm) { NativeLib.dmSendFile(target.id, filePath, name); return }
+        if (target is ConversationTarget.Pm) {
+            if (!NativeLib.dmSendFile(target.id, filePath, name)) throw IllegalStateException("Не удалось отправить вложение")
+            return
+        }
         val chId = target.id
         val ext = filePath.substringAfterLast('.', "").lowercase()
         if (ext in IMAGE_EXTENSIONS) {