No accent highlights when using the numpad

[mathessaricci]

Problem

When I type numbers using my keyboard's numpad there's no highlights on buttons.

Proposal

Use the same behavior when I click on it.

Prior Art (Optional)

There's no prior art. But I recommend some steps to reproduce this issue.

1. Open calculator;
2. Press 1, 2 and 3 using the touchpad or mouse;
3. Press the same numbers on the keyboard.