Issue #1740: Move tool has two identical options for selection mode.
The "move-current" flag does not apply to selection mode and our current code was simply setting the radio buttons insensitive while showing the same labels on both buttons. This was not wrong per-se, yet very confusing. Instead let's just hide the radio buttons in selection mode, and update the option title to "Move selection" (old label of both buttons) to keep this mode as understandable as possible.
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