I'm not sure if this should be considered a bug, but the overview of available Keyboard Shortcuts lists previews for three Convert functions that don't work as expected and documented. The following key combinations
| Alt+Shift+1 | Tag - Filename (Preview) |
|---|---|
| Alt+Shift+2 | Filename - Tag (Preview) |
| Alt+Shift+3 | Filename - Filename (Preview) |
should certainly provide the preview in my notepad++ editor immediately. Instead I get the same dialogbox as if I hadn't used the shortcut with the shift key. The combination with shift obviously has the same effect as the one without the shift key and that probably is not intended.
Furtheremore the dialogbox appearing has a preview button without support of a keyboard shortcut. I already had suggested one in Keyboard Shortcut für Preview (in german).