Caret should go inside font ligatures #19581
Description
Describe the bug
Currently font ligatures are treated as clusters. As a result, users cannot put caret between the letters, and when they try to delete the first character, the whole cluster is removed.
To Reproduce
For example, ffi or لله turn into a single glyph ligature in Calibri.
Expected behavior
Caret steps through the characters.
Avalonia version
12.0.999+27859b9e5456bc5a1ea4146ec8d958c66255b1e0
OS
Windows
Additional context
No response