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The user says that when they switch between a borderless window and a regular window they get a hang.  The stay is below and it looks like SDL waiting for a particular event and possible not getting it so waiting forever?  The user says that doing Alt+Move breaks out of the hang so it maybe triggers the event SDL is waiting for?  The user also says the window decorations never come back so SDL fiddling with the window properties must be the core of the issue.
 
https://github.com/ValveSoftware/Dota-2-Reborn/issues/152
 
#0  0x00007fb93a8dce8d in poll () from /usr/lib/libc.so.6
#1  0x00007fb9367a0a64 in ?? ()
   from /home/matthew/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fb9367a271f in xcb_wait_for_event ()
   from /home/matthew/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fb936c04ba8 in _XReadEvents ()
   from /home/matthew/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libX11.so.6
#4  0x00007fb936bec390 in XIfEvent ()
   from /home/matthew/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/usr/lib/x86_64-linux-gnu/libX11.so.6
#5  0x00007fb93b319a34 in XIfEvent () from /home/matthew/.local/share/Steam/ubuntu12_64/gameoverlayrenderer.so
#6  0x00007fb932c55103 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libSDL2-2.0.so.0
#7  0x00007fb92d4b03f5 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/librendersystemgl.so
#8  0x00007fb93499f54b in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#9  0x00007fb93499f744 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#10 0x00007fb9349094f1 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#11 0x00007fb9349058a5 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#12 0x00007fb9347d0905 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#13 0x00007fb9347d0f21 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#14 0x00007fb9347c79b2 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#15 0x00007fb9347ca338 in ?? ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#16 0x00007fb9347ca4da in Source2Main ()
   from /home/matthew/.dota_library/steamapps/common/dota 2 beta/game/bin/linuxsteamrt64/libengine2.so
#17 0x00007fb93b7520c1 in ?? ()
#18 0x00007fb93a81e790 in __libc_start_main () from /usr/lib/libc.so.6
#19 0x00007fb93b7521bd in _start ()