Only update selection before "Number Tracks", "Copy", "Paste", "From...
Only update selection before "Number Tracks", "Copy", "Paste", "From Filename", "From Tags 1/2" if only a single file is selected to avoid marking files as changed which are not changed. This happened if multiple files were selected, only a subset of the fields was marked and then for example "From Tags 2" was clicked. updateCurrentSelection() set fields with different values (e.g. Track) to an empty value and marked them as changed, before the probably old value was set again by copyV2toV1().
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