Adjust window box for GTK HeaderBar

src/pywinbox/_pywinbox_linux.py

@@ -26,7 +26,40 @@ def _getWindowBox(handle: EwmhWindow) -> Box:
     # https://stackoverflow.com/questions/12775136/get-window-position-and-size-in-python-with-xlib
     geom = handle.xWindow.get_geometry()
     pos = handle.root.translate_coords(handle.id, 0, 0)
-    return Box(pos.x, pos.y, geom.width, geom.height)
+
+    # check if application uses special title bar (a.k.a. GTK HeaderBar)
+    # see: https://docs.gtk.org/gtk4/class.HeaderBar.html
+    # if it has HeaderBar (e.g., gedit):
+    #   top left will be top left including extra space (shadows?)
+    #   in that case, we subtract gtk extents to the right box
+    # if it doesn't (e.g., gvim):
+    #   top left will be top left of client window (i.e., excluding the title bar)
+    #   in that case, we add the title bar to get the right box
+
+    _net_extents = handle._getNetFrameExtents()
+    _gtk_extents = handle._getGtkFrameExtents()
+    if _net_extents and len(_net_extents) >= 4:
+        # this means it has no GTK HeaderBar
+        x = pos.x - int(_net_extents[0])
+        y = pos.y - int(_net_extents[2])
+        w = geom.width + int(_net_extents[0]) + int(_net_extents[1])
+        h = geom.height + int(_net_extents[2]) + int(_net_extents[3])
+    elif _gtk_extents and len(_gtk_extents) >= 4:
+        # this means there is a GTK HeaderBar
+        _gtk_extents = handle._getGtkFrameExtents()
+        x = pos.x + int(_gtk_extents[0])
+        y = pos.y + int(_gtk_extents[2])
+        w = geom.width - int(_gtk_extents[0]) - int(_gtk_extents[1])
+        h = geom.height - int(_gtk_extents[2]) - int(_gtk_extents[3])
+    else:
+        # something else: best guess is to trust pos and geom from above
+        # NOTE: if you have this case and are not getting the expected result,
+        #   please open an issue: https://github.com/Kalmat/PyWinBox/issues/new
+        x = pos.x
+        y = pos.y
+        w = geom.width
+        h = geom.height
+    return Box(x, y, w, h)
 
 
 def _moveResizeWindow(handle: EwmhWindow, newBox: Box):