visualization crash on MacOS Mojave

Trying to run the simple cloud visualization example from:
http://www.pointclouds.org/documentation/tutorials/cloud_viewer.php#cloud-viewer
on MacOS Mojave, running VTK built from master branch and PCL built
from master branch, I am getting the following error:

2018-12-30 02:08:14.191 cloud_viewer[11042:1222647] *** Terminating
app due to uncaught exception 'NSInternalInconsistencyException',
reason: 'NSWindow drag regions should only be invalidated on the Main
Thread!'
*** First throw call stack:
(
0   CoreFoundation                      0x00007fff32b1cecd
__exceptionPreprocess + 256
1   libobjc.A.dylib                     0x00007fff5ebe4720
objc_exception_throw + 48
2   CoreFoundation                      0x00007fff32b3695d
-[NSException raise] + 9
3   AppKit                              0x00007fff30037c8e
-[NSWindow(NSWindow_Theme)
_postWindowNeedsToResetDragMarginsUnlessPostingDisabled] + 324
4   AppKit                              0x00007fff3003507c -[NSWindow
_initContent:styleMask:backing:defer:contentView:] + 1488
5   AppKit                              0x00007fff30034aa6 -[NSWindow
initWithContentRect:styleMask:backing:defer:] + 45
6   libvtkRenderingOpenGL2-8.2.1.dylib  0x000000010bda8b18
_ZN20vtkCocoaRenderWindow13CreateAWindowEv + 1736
7   libvtkRenderingOpenGL2-8.2.1.dylib  0x000000010bdaa49b
_ZN20vtkCocoaRenderWindow10InitializeEv + 59
8   libvtkRenderingOpenGL2-8.2.1.dylib  0x000000010bf9e101
_ZN21vtkOpenGLRenderWindow5StartEv + 49
9   libvtkRenderingOpenGL2-8.2.1.dylib  0x000000010bdaa3cf
_ZN20vtkCocoaRenderWindow5StartEv + 31
10  libvtkRenderingOpenGL2-8.2.1.dylib  0x000000010bdc0537
_ZN30vtkCocoaRenderWindowInteractor10InitializeEv + 727
11  libpcl_visualization.1.9.dylib      0x0000000105f8cc43
_ZN3pcl13visualization13PCLVisualizer16createInteractorEv + 451
12  libpcl_visualization.1.9.dylib      0x0000000105f8c0cd
_ZN3pcl13visualization13PCLVisualizerC2ERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEEb
+ 685
13  libpcl_visualization.1.9.dylib      0x0000000105f8d08c
_ZN3pcl13visualization13PCLVisualizerC1ERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEEb
+ 44
14  libpcl_visualization.1.9.dylib      0x0000000105e8a867
_ZN3pcl13visualization11CloudViewer16CloudViewer_implclEv + 87
15  libpcl_visualization.1.9.dylib      0x0000000105e8a01c
_ZN5boost6detail11thread_dataINS_17reference_wrapperIN3pcl13visualization11CloudViewer16CloudViewer_implEEEE3runEv
+ 28
16  libboost_thread-mt.dylib            0x00000001065e62c8
_ZN5boost12_GLOBAL__N_112thread_proxyEPv + 136
17  libsystem_pthread.dylib             0x00007fff5fea6305 _pthread_body + 126
18  libsystem_pthread.dylib             0x00007fff5fea926f _pthread_start + 70
19  libsystem_pthread.dylib             0x00007fff5fea5415 thread_start + 13
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6

The call stack above is on thread 2.

I guess some changes are needed in
visualization/src/cloud_viewer.cpp:134 in order to allow the
PCLVisualizer pointer viewer_ to be created in the "main" thread (it
looks like Apple broke a lot of people with this one).

Start by running the simple cloud visualization example linked in the issue on macOS Mojave, then inspect visualization/src/cloud_viewer.cpp:134 and the PCLVisualizer creation path shown in the stack trace. Confirm that the visualization no longer raises the main-thread NSWindow exception when the example is run.