Created attachment 5781 Add progressbar to properties dialog This simple patch adds a progressbar showing the amount of used space. It helps to visualise the remaining space more quickly than by having to read the numbers/percentages. See the patch and screenshot attached.
Created attachment 5782 Screenshot of the new properties dialog
Created attachment 5798 Add-a-progressbar-to-the-freespace-indicator-in-the-properties-dialog.patch Updated patch; This packs freespace label and progress bar into a box and makes the box entirely graphical (no text shown), thus small.
Created attachment 5802 Screenshot of hjudt's patch (progressbar below) I generally like that, but keep in mind that it doesn't look equally good with all engines, because not all of them "vertically collapse" the progressbar if there is no label. So while it looks great and appealing with the Murrine engine, it does look very bulky with the Xfce engine (although we could try to fix that in the engine itself).
Created attachment 5804 Add-a-progressbar-to-the-freespace-indicator-in-the-properties-dialog.patch Updated patch with progressbar height fixed to 10px.
This has been applied in http://git.xfce.org/xfce/thunar/commit/?id=e07d6d8ef624abad1f3f2e9e3b1b4398b09dfa62.