Add support for Grim in Wayland sessions ImageGrab

Tests/test_imagegrab.py

@@ -43,6 +43,7 @@ def test_grab_no_xcb(self) -> None:
         if (
             sys.platform not in ("win32", "darwin")
             and not shutil.which("gnome-screenshot")
+            and not shutil.which("grim")
             and not shutil.which("spectacle")
         ):
             with pytest.raises(OSError) as e:

docs/reference/ImageGrab.rst

@@ -16,9 +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`` or ``spectacle`` will be used as a
-    fallback if they are installed. To disable this behaviour, pass ``xdisplay=""``
-    instead.
+    a snapshot of the screen, ``gnome-screenshot``, ``grim`` 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

@@ -89,6 +89,8 @@
         if display_name is None and sys.platform not in ("darwin", "win32"):
             if shutil.which("gnome-screenshot"):
                 args = ["gnome-screenshot", "-f"]
+            elif shutil.which("grim"):
+                args = ["grim"]
             elif shutil.which("spectacle"):
                 args = ["spectacle", "-n", "-b", "-f", "-o"]
             else: