Some as of yet unmerged patches for GNOME Screenshot

I wrote some as of yet unmerged patches and opened some outstanding bug reports to GNOME Screenshot. You can review them here and here.

Last week (september 22, 2018), I was cleaning up old GitHub repositories and came across these patches again. In an attempt to upstream them once more, I found that most of these fixes had already found their way into GNOME screenshot, except one. I opened a merge request for that patch, which was accepted after a small change.