TextInput insert_text and input_filter always destroy active selection

[Matteljay]

Versions

• Python: 3.7.0
• OS: Arch Linux x86_64
• Kivy: 1.10.1
• Kivy installation method: pacman

Description

I am filtering text inside a TextInput box. When I return an empty substring, I am instructing Kivy to "do nothing". However it will always delete any text I currently have selected.
I've also tried simply 'return' or 'return None' from the insert_text function but this still kills the selection. Same for the input_filter property with a function call: there is no way to sustain a selection afaik. Could this get fixed, please?