I'm sure I'm missing something obvious, but I don't see any way to bring up the Viewer outside of the integrated viwer pane.
What I'd like to do is to hit some hot key, and see the file I'm looking at (usually a text file) in a separate window, but using DOpus's viewer as it usually takes too long to launch the associated application. I've downloaded the Source Code plugin to get highlighting, but haven't installed it yet since I don't think it handles this issue.
I find the integrated viewer pane to be too small to be of general use, although when I'm scanning through files it's great.
For image files, assuming you've set double-click to open using the Opus viewer (via filetypes or the override in preferences), you can just double-click the image to open it in a new window. (This does the same thing as double-clicking the file in a file list.)
For text files, as in your example, you can't do this because double-click does something else (highlights the clicked word). You probably also don't want the Opus viewer to be your default application when double-clicking text files.
All is not lost, however. If you select a text (or image or whatever) file and then select File -> File Commands -> Show Pictures from the standard menu, then the Opus viewer will open in a separate window. You can move this button to an easier-to-reach place if you like, or put it on a hotkey.
Also, in the viewer pane or the separate window, you can click the "fullscreen" button in the bottom toolbar (assuming the toolbar is turned on in Preferences / Viewer) which will make the viewer go full-screen. Usually only useful when viewing images, though. (You can click an image in the standalone viewer with the middle mouse button to quickly toggle full-screen mode on and off.)
If you do start using the SourceCodeViewer plugin then it has an additional feature: Right-click the text and select Undock (or press Ctrl-D) and it will create a new standalone window for the text editor. This window is still tied to the lister that launched it, though, so it is generally less useful than using the Show Pictures button which creates a completely standalone viewer.
