Borders that reflect tree structure

[tmandry]

For getting started, see: https://gist.github.com/tmandry/87cbf7e181fc36fc24c8cae1ebf55a85

[tmandry]

If updating borders during a mouse-resize is desired, it may be possible to add an event tap to a mouse drag event, and after each event check the current window's size. This may give more frequent updates than waiting for AX notifications. (It probably also makes sense to use the CG APIs to get the window size instead of asking the application, since this is likely to be faster.)

See:

• this thread
  • says it works smoothly
  • uses window bounds and pid to match AX windows with CG windows
• _AXUIElementGetWindow for a shortcut (undocumented)