[PATCH libinput 0/3] Per-context log handlers

[Peter Hutterer]

This work was motivated by libevdev, which too started out with a global log    
                                                       
handler, and that's biting us now. libevdev is lower-level than libinput, so    
                                                       
there's a higher chance of two unrelated bits loading libevdev into the same    
                                                       
process. Nonetheless, having a global log handler in a library makes me a       
                                                       
bit nervous now.                                                                
                                                       
                                                                                
                                                       
This patchset changes over to a per-context log handler and that breaks the     
                                                       
API in a couple of ways:                                                        
                                                       
* the libinput context is now passed into the log function                      
                                                       
* the user_data pointer was dropped, use the context's user data if needed      
                                                       
* the log handler/priority is now part of the libinput_interface and managed    
                                                       
  by the caller, not by libinput (hence all the libinput_set/get_log*           
                                                       
  functions are gone)                                                           
                                                       
* the udev context creation was split up so we can give the client a            
                                                       
  context before calling a log function that uses that context. I've left       
                                                       
  the old function there for now for some backwards compatibility but tbh       
                                                       
  given that everything else changes I think we should just drop                
                                                       
  libinput_udev_create_for_seat().                                              
                                                       
                                                                                
                                                       
Cheers,                                                                         
                                                       
  Peter   
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