Preview
Preview function is for check rename result before real operation. If you are not sure what your operation's result, you could click 'preview' button to see what will be renamed. If you want to reselect files or remove some files, you should click 'select' button to return select files window to do that.
In preview window, you can click 'Rename' button to proceed real operation if preview is what you want.
If new filename is same as old filename, preview will not show it.
To improve efficiency, it need not display all the result to know the real operation. You can set the number of result to show in the options.
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