This is a follow up to bug #671944, where the file open dialog had issues with previewing non-thumbnailed images. The original issue was fixed but some other non-critical issues were not addressed:

1) If no thumbnail exists the dialog only previews images smaller than 100KB. This was a good limit a few years ago, but should likely be increased considering that todays digital camera's shoot pictures several MBs large.
For reference: GIMP's file open dialog thumbnails an image in the 2MB range near instantly on my system.

2) If no thumbnail is shown the preview bar is hidden. This makes the file list resize which is a bit distracting if unpreviewable images are mixed with previewable images.


In my opinion GIMP's file open dialog shows pretty nicely how these could be solved. eog's dialog could auto-thumbnail images up to a certain limit (2-3 Megs, more?) and show a placeholder image for larger images. Clicking the placeholder will then trigger the thumbnailing process. This could also be used to have a user-triggered thumbnail update.


+++ This bug was initially created as a clone of Bug #671944 +++

Current policy is not sufficient in handling files with not yet generated thumbnails. Even simple screenshot of my desktop is PNG file with size smaller than 100KB but of large resolution 1440x900. Therefore when I click it preview is generated and it is much too large.

I see two possible solutions. First is too query loaded pixbuf for its dimensions and then judge if preview should be generated. Second is to enforce generating thumbnails for files which don't have yet. I suppose that the second solution is bad choice since it affects users precious time so I implemented draft of the first.

Basically, what is left is choosing arbitrary size of thumbnails or let it be customized (I prefer the first).