LineEdit behaves erratically when a zone of text is replaced and backspace is used

[SkyLucilfer]

Godot version:
3.2 c7ad8f5

OS/device including version:
Android 9, Huawei

Issue description:
When a zone of text is selected and replaced in LineEdit, delete operations afterwards will behave in a buggy way, randomly replacing and adding characters.

Related to #27065 , but as far as I know it's not caused by the same bug.

Steps to reproduce:

1. Create an empty project, add Node2D and LineEdit.
2. Export to Android.
3. Type a line in LineEdit on Android, for example "A very good game"
4. Select a zone of text, for example the last 3 characters "ame"
5. Replace the selected text with any character or backspace.
6. Continue using backspace after that. It will delete and add random characters in the same time.