CTRL+U issue

[jcubic]

Expected behavior

CTRL+U should clear command before cursor

Actual behavior

It sometimes show source code (default behavior)

Steps to reproduce

Play with terminal for a while press CTRL+U few times

Notes

this works:

$(document).keydown(function(e) {
    if (e.key.toLowerCase() === 'u' && e.ctrlKey) {
        return false;
    }
});

so the problem is in terminal code, this may be related to #485

[jcubic]

The problem was that after hold any key and change key the hold flag was not cleared. So next key was also marked as hold.