[vtkusers] Rendering bug with VTK 7.0 + Qt 5.7 (non-retina MacBook)

[Enzo Matsumiya]

Hi,

Recently I came across this issue on a non-retina Mac, where the rendering
will show some artifacts, but also will perform some unwanted actions by
itself, such as windowing, reslicing and some elements (e.g.
vtkResliceCursorWidget) goes missing at random.

Some information:
MacBook mid-2012 Core i5, non-retina
Intel HD Graphics 4000
Mac OS X 10.11.6

VTK 7.0 stable
Compiled with clang
Dynamic libs
Release build type
OpenGL2 backend

Qt 5.7
Default installation from the OSX package

Here is an example screenshot of what kind of artifacts I'm seeing:

https://i.imgsafe.org/8c735567e8.png


Thanks in advance.
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