Otherwise it can end up not propogating to windows properly, and they will never recieve the PointerMotion event.
All this seemed to be doing was trapping what was going to be sent to the game, and then using it, despite us already always knowing the cursor position.
Essentially just shoves that into the horizontal pass and cleans it out of the normal composite when we go to do vertical and also makes the blur image the same size as the output, which should have been done anwyay to avoid harsh borders.
The size argument must not include the `long msg_type` field.
Fixes the following ASan error:
=================================================================
==25745==ERROR: AddressSanitizer: global-buffer-overflow on address 0x55cb6beea08a at pc 0x7f118e89525d bp
0x7f117620a8a0 sp 0x7f117620a048
READ of size 50 at 0x55cb6beea08a thread T10
#0 0x7f118e89525c in __interceptor_msgsnd /usr/src/debug/gcc/libsanitizer/sanitizer_common/sanitizer_c
ommon_interceptors.inc:3138
#1 0x55cb6b6518ed in mangoapp_update(unsigned long, unsigned long, unsigned long) ../src/mangoapp.cpp:
48
#2 0x55cb6b484dde in imageWaitThreadMain() ../src/steamcompmgr.cpp:521
#3 0x55cb6b538298 in void std::__invoke_impl<void, void (*)()>(std::__invoke_other, void (*&&)()) /usr
/include/c++/11.2.0/bits/invoke.h:61
#4 0x55cb6b5381b3 in std::__invoke_result<void (*)()>::type std::__invoke<void (*)()>(void (*&&)()) /u
sr/include/c++/11.2.0/bits/invoke.h:96
#5 0x55cb6b538063 in void std:🧵:_Invoker<std::tuple<void (*)()> >::_M_invoke<0ul>(std::_Index_t
uple<0ul>) /usr/include/c++/11.2.0/bits/std_thread.h:253
#6 0x55cb6b537f23 in std:🧵:_Invoker<std::tuple<void (*)()> >::operator()() /usr/include/c++/11.
2.0/bits/std_thread.h:260
#7 0x55cb6b537ae9 in std:🧵:_State_impl<std:🧵:_Invoker<std::tuple<void (*)()> > >::_M_run
() /usr/include/c++/11.2.0/bits/std_thread.h:211
#8 0x7f118e0a34d3 in execute_native_thread_routine /usr/src/debug/gcc/libstdc++-v3/src/c++11/thread.cc
:82
#9 0x7f118d3d75c1 in start_thread (/usr/lib/libc.so.6+0x8d5c1)
#10 0x7f118d45c583 in __clone (/usr/lib/libc.so.6+0x112583)
0x55cb6beea08a is located 0 bytes to the right of global variable 'mangoapp_msg_v1' defined in '../src/mangoapp.cpp:27:27' (0x55cb6beea060) of size 42
Tracks consecutive missed frames much better, handles latent buffers much better.
Disable mangoapp hack for now -- it's obscuring useful data, need a better solution.
Disable low latency by default, still controlable by atom.
