Avoid ugly flash of small window during startup.
Avoid ugly flash of small window during startup.

Electrum 2.x flashes a small window during startup before the main window appears.
This turns out to be the fee edit box being enabled in create_send_tab().
Setting it to visible when the grid containing it is unparented causes QT to actually
display a window with just the edit box widget for some reason.  So defer the
call to set its visibility until the grid is parented.

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