Description of problem:
I'm testing "gimagereader-gtk-3.1.99-1.fc25.x86_64" on Fedora 25 Workstation (Wayland session). The "Capture screenshot" functionality seems broken, as it throw an unhandled exception when invoked.

This does not appear to be a regression, since the "3.1.91-1" is affected by the same bug.

Version-Release number of selected component (if applicable):
gimagereader-gtk-3.1.99-1.fc25.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Open gtkimagereader-gtk from the terminal emulator
2. On the left side of the GUI, click the appropriate button in order to take a screenshot.

Actual results:
1.  The GUI gets stuck
2. The following output is printed on the terminal emulator:

(gimagereader-gtk:5330): Gdk-CRITICAL **: gdk_pixbuf_get_from_surface: assertion 'width > 0 && height > 0' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_bits_per_sample: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_width: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_height: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_rowstride: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_has_alpha: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GdkPixbuf-CRITICAL **: gdk_pixbuf_get_pixels_with_length: assertion 'GDK_IS_PIXBUF (pixbuf)' failed

(gimagereader-gtk:5330): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

(gimagereader-gtk:5330): glibmm-CRITICAL **: 
unhandled exception (type Glib::Error) in signal handler:
domain: gdk-pixbuf-error-quark
code  : 5
what  : Errore critico nel file di immagine PNG: Invalid IHDR data


Expected results:
1. Ideally, the software should capture the screenshot without issues.
2. Ideally, no exceptions should be thrown on the terminal emulator.

Additional info:
I'm testing with qemu-kvm