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-How updates happen for struts, workareas, and screen/xinerama regions/edges:
-  One of three things causes meta_window_update_struts to be called
-    (a) initial window map (window.c:meta_window_new_with_attrs())
-    (b) update of _net_wm_strut* properties (window.c:process_property_notify())
-    (c) screen resizes (e.g. via xrandr; from screen.c:meta_screen_resize_func())
-  meta_window_update_struts (MetaWindow *window)
-    - Gets new list of struts from window properties
-    - Makes sure window doesn't single-handedly fill the screen
-    - records new struts if different and calls invalidate_work_areas()
-  invalidate_work_areas ()
-    - Calls meta_workspace_invalidate_work_area() for each workspace it's on
-  meta_workspace_invalidate_work_area()
-    - Cleans out all strut lists
-    - queues all windows for resizing
-    - Calls meta_screen_queue_workarea_recalc (workspace->screen);
-  meta_screen_queue_workarea_recalc()
-    - Adds set_work_area_idle_func() as an idle handler
-
-  set_work_area_idle_func()
-    - Calls set_work_area_hint()
-  set_work_area_hint()
-    - Calls meta_workspace_get_work_area_all_xineramas()
-    - Sets _NET_WORKAREA property
-  meta_workspace_get_work_area_all_xineramas()
-    - Calls ensure_work_areas_validated()
-  ensure_work_areas_validated()
-    - Loops over xineramas
-      - Loops over windows, then struts:
-        - Adds struts to list first time through xinerama loop
-        - Find the amount of the strut on the given xinerama for <dir>_strut
-        - Just max the amount of the strut with the all_<dir>_strut
-      - Makes sure there's a non-empty xinerama workarea
-      - Record the xinerama workarea
-    - Make sure there's a non-empty screen workarea
-    - Record the screen workarea
-    - Cache the spanning rects for the screen and xinerama regions
-    - Cache the screen and xinerama edges
-
-  Alternatively to all the above, if the idle function for the screen
-  has not yet fired, constraints.c:setup_constraint_info() can call
-  either workspace.c:meta_workspace_get_onscreen_region() or
-  workspace.c:meta_workspace_get_onxinerama_region() which in turn
-  call workspace.c:ensure_work_areas_validated().
-
-Meaning of related functions that might be difficult to tell apart:
-  screen.c:meta_screen_get_current_xinerama ()
-    - Finds out which xinerama the mouse is on with an XQueryPointer
-  window.c:meta_window_get_work_area_current_xinerama()
-  window.c:meta_window_get_work_area_for_xinerama()
-  window.c:meta_window_get_work_area_all_xineramas ()
-    - All three are for finding the intersection of workareas across
-      multiple workspaces so that placement of windows can be
-      determined in such a way that they remain in the workarea for
-      all workspaces that they are on.