text_query does not work for input boxes with multiple fonts

[pyfisch]

The text queries do not work when I mix different scripts like in "Επιστήμη υπολογιστών foobar". It will be impossible to move the cursor inside one part of the text.

Testcase:

<style>
    body {
        font-size: 40px;
    }
</style>
<input value="foo τύπο bar">

Try to place the cursor between all two characters with the mouse.