Memory isn't freed after downscaling
Submitted by swo..@..ol.com
To make a test for this bug report (https://bugzilla.gnome.org/show_bug.cgi?id=719619) I have scaled up an image with the dimension of 1680x1050 to 53760x33600. This process was successfull and my system ended up in using all of his 16 GiB of memory with 4 GiB of memory in the swap. To make another test I have scaled down this image back to 1680x1050 but after the downscaling finished GIMP has still used this huge amount of memory. This is especially a problem because GIMP claimed on exporting it hasn't enough memory to export the image.