If all text in a TextInput is selected and ctrl+backspace is pressed, the selection is cleared but no text is removed.

Steps to reproduce (tested on Windows 10):

1. Create a new project with the Qt Quick Application - Empty template
2. Add a TextInput with anchors.fill: parent
3. Run the project
4. Type some text into the textbox
5. Select all the text with ctrl+a
6. Press ctrl+backspace

Expected behavior:
The selected text is removed.

Actual behavior:
The cursor jumps to the beginning of the TextInput and the text is deselected, but no text is removed.