[Cuis-dev] StringRequestMorph little fix

[Luciano Notarfrancesco]

This is a tweak to the recent changes in StringRequestMorph to restore the
original keyboard focus. It was still failing in some cases (eg, open a
browser, focus the system categories list, cmd-f, enter). This fixes that
issue and also moves the restoring of the keyboard focus to a single place
(>>#delete).

Also, the change set includes a modification to
StringRequestMorph>>#addTextPane to make the layout where the two buttons
live transparent, otherwise it looks word in dark themes. It seems to not
change anything in the default theme tho, but let me know if you think this
is wrong or if there's a better way to do it. (I personally wouldn't
include those buttons on the dialog, because it's something to use the
keyboard with, type some text and enter, or esc, suggesting the user to
switch to mouse is awkward, IMHO).

The other change set just adds a couple of unicode characters for music to
the named characters list.

Cheers,
Luciano
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