Matlab focus fixer

Prevents Matlab from stealing focus. Tries to set the _NET_WM_USER_TIME to a proper value to get the correct window behavior.

The focus is only given to windows which have been started less then 2 sec (2000 ms) since last user interaction in Matlab.

The idea is to intercept the X11 calls with a dynamic library (via LD_PRELOAD) and patch the calls to comply with the X11 documentation.

Build

make

LD_PRELOAD=$PWD/focus_fixer.so matlab

Make new windows minimized if main window is out of focus (not the active window).
Make new windows show up in parent windows workspace.
Set the PID of the splash screen and make it not on always on top
Use the splash screen workspace location for the main window.
Clean the code up :)
License, wmctrl is GPL ?, the initial version worked without snippets of code from wmctrl.

https://bugs.openjdk.java.net/browse/JDK-6553134 (Java bug which Matlab implements ;))
https://github.com/dancor/wmctrl/blob/master/main.c
https://chromium.googlesource.com/chromium/src/+/5e16d46c92747ae76914b9a5db114a19cdb00bde/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
https://mail.gnome.org/archives/wm-spec-list/2009-February/msg00006.html (why to only use key/button press)
http://www.sbin.org/doc/Xlib/chapt_16.html
http://www.semicomplete.com/blog/geekery/xsendevent-xdotool-and-ld_preload.html ( mock this method to get event time stamps )
https://github.com/deepfire/ld-preload-xcreatewindow-net-wm-pid/blob/master/ld-preload-xcreatewindow.c (add PID to splash)
https://codereview.chromium.org/317783012/patch/50001/60001 (Fixes for chromes focus behavior)
https://mail.gnome.org/archives/desktop-devel-list/2004-August/msg00159.html (Good discussion how it is suppose to work)
http://www.chiark.greenend.org.uk/~sgtatham/xtruss/ (To trace the X11 chit chat ;) )