Change menu action title for existing rooms.

vector/src/main/java/im/vector/app/features/createdirect/CreateDirectRoomActivity.kt

@@ -91,7 +91,8 @@ class CreateDirectRoomActivity : SimpleFragmentActivity() {
                     KnownUsersFragment::class.java,
                     KnownUsersFragmentArgs(
                             title = getString(R.string.fab_menu_create_chat),
-                            menuResId = R.menu.vector_create_direct_room
+                            menuResId = R.menu.vector_create_direct_room,
+                            isCreatingRoom = true
                     )
             )
         }

vector/src/main/java/im/vector/app/features/userdirectory/KnownUsersFragment.kt

@@ -91,6 +91,9 @@ class KnownUsersFragment @Inject constructor(
             val showMenuItem = it.pendingInvitees.isNotEmpty()
             menu.forEach { menuItem ->
                 menuItem.isVisible = showMenuItem
+                if (args.isCreatingRoom) {
+                    menuItem.setTitle(if (it.isThereAnExistingRoom) R.string.action_open else R.string.create_room_action_create)
+                }
             }
         }
         super.onPrepareOptionsMenu(menu)

vector/src/main/java/im/vector/app/features/userdirectory/KnownUsersFragmentArgs.kt

@@ -23,5 +23,6 @@ import kotlinx.android.parcel.Parcelize
 data class KnownUsersFragmentArgs(
         val title: String,
         val menuResId: Int,
-        val excludedUserIds: Set<String>? = null
+        val excludedUserIds: Set<String>? = null,
+        val isCreatingRoom: Boolean = false
 ) : Parcelable

vector/src/main/java/im/vector/app/features/userdirectory/UserDirectoryViewModel.kt

@@ -87,14 +87,37 @@ class UserDirectoryViewModel @AssistedInject constructor(@Assisted
 
     private fun handleRemoveSelectedUser(action: UserDirectoryAction.RemovePendingInvitee) = withState { state ->
         val selectedUsers = state.pendingInvitees.minus(action.pendingInvitee)
-        setState { copy(pendingInvitees = selectedUsers) }
+        setState {
+            copy(
+                    pendingInvitees = selectedUsers,
+                    isThereAnExistingRoom = isThereAnExistingRoom(selectedUsers)
+            )
+        }
     }
 
     private fun handleSelectUser(action: UserDirectoryAction.SelectPendingInvitee) = withState { state ->
         // Reset the filter asap
         directoryUsersSearch.accept("")
         val selectedUsers = state.pendingInvitees.toggle(action.pendingInvitee)
-        setState { copy(pendingInvitees = selectedUsers) }
+        setState {
+            copy(
+                    pendingInvitees = selectedUsers,
+                    isThereAnExistingRoom = isThereAnExistingRoom(selectedUsers)
+            )
+        }
+    }
+
+    private fun isThereAnExistingRoom(selectedUsers: Set<PendingInvitee>): Boolean {
+        return selectedUsers
+                .takeIf { it.size == 1 }
+                ?.firstOrNull()
+                ?.let { invitee ->
+                    return when (invitee) {
+                        is PendingInvitee.UserPendingInvitee     -> session.getExistingDirectRoomWithUser(invitee.user.userId) != null
+                        is PendingInvitee.ThreePidPendingInvitee -> false
+                    }.exhaustive
+                }
+                ?: false
     }
 
     private fun observeDirectoryUsers() = withState { state ->

vector/src/main/java/im/vector/app/features/userdirectory/UserDirectoryViewState.kt

@@ -30,7 +30,8 @@ data class UserDirectoryViewState(
         val pendingInvitees: Set<PendingInvitee> = emptySet(),
         val createAndInviteState: Async<String> = Uninitialized,
         val directorySearchTerm: String = "",
-        val filterKnownUsersValue: Option<String> = Option.empty()
+        val filterKnownUsersValue: Option<String> = Option.empty(),
+        val isThereAnExistingRoom: Boolean = false
 ) : MvRxState {
 
     constructor(args: KnownUsersFragmentArgs) : this(excludedUserIds = args.excludedUserIds)