Don't show files other than still pictures in the sidebar when inside a single image view, no matter what the browser's filter is
In GThumb's "browser" view, there is a "Show:" filter combobox at the bottom that lets you see "All", "All images", "Video" and "Personalize...". I guess I can see to some extent the appeal of showing "more than just image files" when you are in the broad browser view, making GThumb act a bit like a file manager:
...but this does not make sense in the sidebar when inside an individual image view:
...as you very quickly end up with:
I mean, it's showing me (and therefore, letting me "view" when I switch between "images" with PgUp/PgDn) a bunch of files that GThumb is absolutely incapable of truly viewing anyway, including:
- rich text documents, plain text documents (.txt), markdown files
- Scribus (.SLA) files
- PDF documents
...this is all noise and it shouldn't be in my face when I'm in single-image-view*, especially since I opened the image file from Nautilus, so that GThumb gives me clarity compared to the kitchen sink that Nautilus's file listing is inside a cluttered folder. When GThumb is called by another app to view an image, the assumption is that the user wants to view images rather than files (which is why, I presume, GThumb doesn't even show the filenames in the sidebar in that case). In this context, I want to be able to flip (with PgUp/PgDn) only between media files that gthumb can actually render, that is, images, like this:
Otherwise, if I wanted all the noise, I'd use Nautilus, or maybe GThumb's browser mode (but I'd rather prefer GThumb just offered me a prominent "Open the containing folder in [file management app]" button, then).
*: technically, I believe the file types I listed above should not even be shown in the browser view (because GThumb is unable to display them as anything more than thumbnails, so what's the point?), but I suppose that's debatable...