Add KDE Wayland support for ImageGrab

Tests/test_imagegrab.py

@@ -40,8 +40,10 @@ def test_grab_x11(self) -> None:
 
     @pytest.mark.skipif(Image.core.HAVE_XCB, reason="tests missing XCB")
     def test_grab_no_xcb(self) -> None:
-        if sys.platform not in ("win32", "darwin") and not shutil.which(
-            "gnome-screenshot"
+        if (
+            sys.platform not in ("win32", "darwin")
+            and not shutil.which("gnome-screenshot")
+            and not shutil.which("spectacle")
         ):
             with pytest.raises(OSError) as e:
                 ImageGrab.grab()

docs/reference/ImageGrab.rst

@@ -16,8 +16,9 @@ or the clipboard to a PIL image memory.
     the entire screen is copied, and on macOS, it will be at 2x if on a Retina screen.
 
     On Linux, if ``xdisplay`` is ``None`` and the default X11 display does not return
-    a snapshot of the screen, ``gnome-screenshot`` will be used as fallback if it is
-    installed. To disable this behaviour, pass ``xdisplay=""`` instead.
+    a snapshot of the screen, ``gnome-screenshot`` or ``spectacle`` will be used as a
+    fallback if they are installed. To disable this behaviour, pass ``xdisplay=""``
+    instead.
 
     .. versionadded:: 1.1.3 (Windows), 3.0.0 (macOS), 7.1.0 (Linux)
 

src/PIL/ImageGrab.py

@@ -77,14 +77,16 @@
             raise OSError(msg)
         size, data = Image.core.grabscreen_x11(display_name)
     except OSError:
-        if (
-            display_name is None
-            and sys.platform not in ("darwin", "win32")
-            and shutil.which("gnome-screenshot")
-        ):
+        if display_name is None and sys.platform not in ("darwin", "win32"):
+            if shutil.which("gnome-screenshot"):
+                args = ["gnome-screenshot", "-f"]
+            elif shutil.which("spectacle"):
+                args = ["spectacle", "-n", "-b", "-f", "-o"]
+            else:
+                raise
             fh, filepath = tempfile.mkstemp(".png")
             os.close(fh)
-            subprocess.call(["gnome-screenshot", "-f", filepath])
+            subprocess.call(args + [filepath])
             im = Image.open(filepath)
             im.load()
             os.unlink(filepath)