Exception

[kostyaten]

Screen_recording_20250919_134754.mp4

The following assertion was thrown while applying input formatters:
'dart:ui/text.dart': Failed assertion: line 2599 pos 50: '': is not true.

When the exception was thrown, this was the stack:
#2 new TextRange.collapsed (dart:ui/text.dart:2599:50)
#3 new TextSelection.collapsed (package:flutter/src/services/text_editing.dart:34:13)
#4 PhoneInputFormatter.formatEditUpdate (package:flutter_multi_formatter/formatters/phone_input_formatter.dart:137:32)
#5 EditableTextState._formatAndSetValue. (package:flutter/src/widgets/editable_text.dart:4493:29)
#6 ListBase.fold (dart:collection/list.dart:202:22)
#7 EditableTextState._formatAndSetValue (package:flutter/src/widgets/editable_text.dart:4490:37)
#8 EditableTextState.userUpdateTextEditingValue (package:flutter/src/widgets/editable_text.dart:4934:5)
#9 EditableTextState._replaceText (package:flutter/src/widgets/editable_text.dart:5329:5)
#10 CallbackAction.invoke (package:flutter/src/widgets/actions.dart:596:39)
#11 Action._invoke (package:flutter/src/widgets/actions.dart:335:10)
#12 ActionDispatcher.invokeAction (package:flutter/src/widgets/actions.dart:640:19)
#13 Actions.invoke. (package:flutter/src/widgets/actions.dart:964:48)
#14 Actions._visitActionsAncestors (package:flutter/src/widgets/actions.dart:746:18)
#15 Actions.invoke (package:flutter/src/widgets/actions.dart:958:30)
#16 _DeleteTextAction.invoke (package:flutter/src/widgets/editable_text.dart:6394:20)
#17 _OverridableContextAction.invokeDefaultAction (package:flutter/src/widgets/actions.dart:1808:28)
#18 _OverridableActionMixin.invoke (package:flutter/src/widgets/actions.dart:1668:11)
#19 Action._invoke (package:flutter/src/widgets/actions.dart:334:45)
#20 ActionDispatcher.invokeActionIfEnabled (package:flutter/src/widgets/actions.dart:665:28)
#21 ShortcutManager.handleKeypress (package:flutter/src/widgets/shortcuts.dart:935:9)
#22 _ShortcutsState._handleOnKeyEvent (package:flutter/src/widgets/shortcuts.dart:1135:20)
#23 _HighlightModeManager.handleKeyMessage (package:flutter/src/widgets/focus_manager.dart:2244:72)
#24 KeyEventManager._dispatchKeyMessage (package:flutter/src/services/hardware_keyboard.dart:1119:34)
#25 KeyEventManager.handleRawKeyMessage (package:flutter/src/services/hardware_keyboard.dart:1195:17)
#26 BasicMessageChannel.setMessageHandler. (package:flutter/src/services/platform_channel.dart:259:49)
#27 _DefaultBinaryMessenger.setMessageHandler. (package:flutter/src/services/binding.dart:653:35)
#28 _invoke2 (dart:ui/hooks.dart:362:13)
#29 _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:45:5)
#30 _Channel.push (dart:ui/channel_buffers.dart:136:31)
#31 ChannelBuffers.push (dart:ui/channel_buffers.dart:344:17)
#32 PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:799:22)
#33 _dispatchPlatformMessage (dart:ui/hooks.dart:276:31)
(elided 2 frames from class _AssertionError)

flutter_multi_formatter - 2.13.10
Flutter 3.35.4
Dart 3.9.2

[PWrzesinski]

I think I've got the same issue. The steps to get it are to provide the PhoneInputFormatter with a number longer than it expects that contains characters other than just numbers (spaces, dashes, etc.). Like in your video when the country changes, so the number becomes too long for the new country.

Here is a short reproduction code:

print(
  PhoneInputFormatter().formatEditUpdate(
    const TextEditingValue(text: ""),
    const TextEditingValue(text: "+1 (234) 567-8900-1234"),
  ),
);