Crash in android

[Coloryr]

android.runtime.JavaProxyThrowable: System.ArgumentOutOfRangeException: Value must be between 1 and 105 Arg_ParamName_Name, number
ArgumentOutOfRange_ActualValue, 0
   at AvaloniaEdit.Document.TextDocument.GetLineByNumber(Int32 number)
   at AvaloniaEdit.Document.TextDocument.GetOffset(Int32 line, Int32 column)
   at AvaloniaEdit.Document.TextDocument.GetOffset(TextLocation location)
   at AvaloniaEdit.Editing.Selection.Create(TextArea textArea, TextViewPosition start, TextViewPosition end)
   at AvaloniaEdit.Editing.EmptySelection.StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
   at AvaloniaEdit.Editing.TextArea.TextAreaTextInputMethodClient.set_Selection(TextSelection value)
   at Avalonia.Android.AndroidInputMethod`1[[Avalonia.Android.Platform.SkiaPlatform.TopLevelImpl.ViewImpl, Avalonia.Android, Version=11.0.4.0, Culture=neutral, PublicKeyToken=c8d484a7012f9a8b]].OnSurroundingTextChanged()
   at Avalonia.Android.AndroidInputMethod`1[[Avalonia.Android.Platform.SkiaPlatform.TopLevelImpl.ViewImpl, Avalonia.Android, Version=11.0.4.0, Culture=neutral, PublicKeyToken=c8d484a7012f9a8b]]._client_SurroundingTextChanged(Object , EventArgs )
   at Avalonia.Input.TextInput.TextInputMethodClient.RaiseSurroundingTextChanged()
   at AvaloniaEdit.Editing.TextArea.TextAreaTextInputMethodClient.Caret_PositionChanged(Object sender, EventArgs e)
   at AvaloniaEdit.Editing.Caret.RaisePositionChanged()
   at AvaloniaEdit.Editing.Caret.set_Position(TextViewPosition value)
   at AvaloniaEdit.Editing.SelectionMouseHandler.SetCaretOffsetToMousePosition(PointerEventArgs e, ISegment allowedSegment)
   at AvaloniaEdit.Editing.SelectionMouseHandler.TextArea_MouseLeftButtonDown(Object sender, PointerPressedEventArgs e)
   at Avalonia.Interactivity.Interactive.<AddHandler>g__InvokeAdapter|4_0[PointerPressedEventArgs](Delegate , Object , RoutedEventArgs )
   at Avalonia.Interactivity.Interactive.<>c__4`1[[Avalonia.Input.PointerPressedEventArgs, Avalonia.Base, Version=11.0.999.0, Culture=neutral, PublicKeyToken=c8d484a7012f9a8b]].<AddHandler>b__4_1(Delegate , Object , RoutedEventArgs )
   at Avalonia.Interactivity.EventRoute.RaiseEventImpl(RoutedEventArgs )
   at Avalonia.Interactivity.EventRoute.RaiseEvent(Interactive , RoutedEventArgs )
   at Avalonia.Interactivity.Interactive.RaiseEvent(RoutedEventArgs )
   at Avalonia.Input.TouchDevice.ProcessRawEvent(RawInputEventArgs )
   at Avalonia.Input.InputManager.ProcessInput(RawInputEventArgs )
   at Avalonia.Controls.TopLevel.HandleInput(RawInputEventArgs )
   at Avalonia.Android.Platform.Specific.Helpers.AndroidMotionEventsHelper.DispatchMotionEvent(MotionEvent , Boolean& )
   at Avalonia.Android.Platform.SkiaPlatform.TopLevelImpl.ViewImpl.DispatchTouchEvent(MotionEvent )
   at Android.Views.View.n_DispatchTouchEvent_Landroid_view_MotionEvent_(IntPtr , IntPtr , IntPtr )
   at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPL_Z(_JniMarshal_PPL_Z , IntPtr , IntPtr , IntPtr )
	at crc64bd239b21961e24ab.TopLevelImpl_ViewImpl.n_dispatchTouchEvent(Native Method)
	at crc64bd239b21961e24ab.TopLevelImpl_ViewImpl.dispatchTouchEvent(TopLevelImpl_ViewImpl.java:73)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:3249)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2881)
	at com.android.internal.policy.DecorView.superDispatchTouchEvent(DecorView.java:765)
	at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:2013)
	at android.app.Activity.dispatchTouchEvent(Activity.java:4180)
	at androidx.appcompat.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:70)
	at com.android.internal.policy.DecorView.dispatchTouchEvent(DecorView.java:697)
	at android.view.View.dispatchPointerEvent(View.java:13967)
	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:6489)
	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:6284)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5673)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5726)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5692)
	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5850)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5700)
	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5907)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5673)
	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5726)
	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5692)
	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5700)
	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5673)
	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:8857)
	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:8777)
	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:8730)
	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:9117)
	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:239)
	at android.os.MessageQueue.nativePollOnce(Native Method)
	at android.os.MessageQueue.next(MessageQueue.java:363)
	at android.os.Looper.loop(Looper.java:176)
	at android.app.ActivityThread.main(ActivityThread.java:8673)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1109)

[pazof]

I got it fixed by improving the setter for the TextEdit.Selection :

index 4414f39..7b8b4dd 100644
--- a/src/AvaloniaEdit/Editing/TextArea.cs
+++ b/src/AvaloniaEdit/Editing/TextArea.cs
@@ -20,6 +20,7 @@ using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Primitives;
+using Avalonia.Dialogs.Internal;
 using Avalonia.Input;
 using Avalonia.Input.TextInput;
 using Avalonia.Interactivity;
@@ -1200,8 +1201,9 @@ namespace AvaloniaEdit.Editing
                 }
                 set
                 {
-                    var selection = _textArea.Selection;
-
+                    if (_textArea == null) return;
+                    var selection =  _textArea.Selection;
+                    if (selection.StartPosition.Line == 0) return;
                     _textArea.Selection = selection.StartSelectionOrSetEndpoint(
                         new TextViewPosition(selection.StartPosition.Line, value.Start),
                         new TextViewPosition(selection.StartPosition.Line, value.End));