Fix merge and save copy in KDB database

app/src/main/java/com/kunzisoft/keepass/activities/GroupActivity.kt

@@ -276,6 +276,9 @@ class GroupActivity : DatabaseLockActivity(),
             inflateMenu(R.menu.settings)
             inflateMenu(R.menu.database_extra)
             inflateMenu(R.menu.about)
+            if (!mMergeDataAllowed) {
+                menu.findItem(R.id.menu_merge_from)?.isVisible = false
+            }
             setNavigationItemSelectedListener { menuItem ->
                 when (menuItem.itemId) {
                     R.id.menu_app_settings -> {
@@ -289,7 +292,7 @@ class GroupActivity : DatabaseLockActivity(),
                         mExternalFileHelper?.createDocument(
                             getString(R.string.database_file_name_default) +
                             getString(R.string.database_file_name_copy) +
-                                    getString(R.string.database_file_extension_default))
+                            mDatabase?.defaultFileExtension)
                     }
                     R.id.menu_contribute -> {
                         UriUtil.gotoUrl(this@GroupActivity, R.string.contribution_url)

app/src/main/java/com/kunzisoft/keepass/database/element/Database.kt

@@ -274,6 +274,9 @@ class Database {
         }
     }
 
+    val defaultFileExtension: String
+        get() = mDatabaseKDB?.defaultFileExtension ?: mDatabaseKDBX?.defaultFileExtension ?: ".bin"
+
     val type: Class<*>?
         get() = mDatabaseKDB?.javaClass ?: mDatabaseKDBX?.javaClass
 

app/src/main/java/com/kunzisoft/keepass/database/element/database/DatabaseKDB.kt

@@ -64,6 +64,9 @@ class DatabaseKDB : DatabaseVersioned<Int, UUID, GroupKDB, EntryKDB>() {
     override val version: String
         get() = "V1"
 
+    override val defaultFileExtension: String
+        get() = ".kdb"
+
     init {
         // New manual root because KDB contains multiple root groups (here available with getRootGroups())
         rootGroup = createGroup().apply {

app/src/main/java/com/kunzisoft/keepass/database/element/database/DatabaseKDBX.kt

@@ -201,6 +201,9 @@ class DatabaseKDBX : DatabaseVersioned<UUID, UUID, GroupKDBX, EntryKDBX> {
             return "V2 - KDBX$kdbxStringVersion"
         }
 
+    override val defaultFileExtension: String
+        get() = ".kdbx"
+
     private open class NodeOperationHandler<T: NodeKDBXInterface> : NodeHandler<T>() {
         var containsCustomData = false
         override fun operate(node: T): Boolean {

app/src/main/java/com/kunzisoft/keepass/database/element/database/DatabaseVersioned.kt

@@ -62,6 +62,7 @@ abstract class DatabaseVersioned<
         protected set
 
     abstract val version: String
+    abstract val defaultFileExtension: String
 
     /**
      * To manage binaries in faster way