Selected text is not always cleared when typing

[slavafomin]

There is a use-case pattern when user presses Ctrl+A and then Backspace to clear the input. However it doesn't work around delimiters.

How to reproduce:

1. Enter 5213, then space is automatically inserted: 5213 .
2. Press Ctrl+A and then Backspace.

It will remove only the last character, instead of entire string.

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Also, there is another failing pattern:

Enter 123, then press Ctrl+A, then start to type the replacement number. It will not clear the selected text.