measure tool and other mouse funniness

[jessdtate]

Description

this is in my build of master on OS X 10.12 with QT 5.12. The binary release seems to work ok.

When using the measure tool, the points selected do not always match the location of the mouse. Changing the world space seems to make it break more regularly.

Changing the coordinate space can also affect the paint brush tool.

Also sometime the location in the corner does not update on mouse movements, just on mouse commands (scroll, click).

Steps to Reproduce

1. load in image data. Seems to mess up more when loaded as an image than as a segmentation heart.nrrd.zip
2. open measure tool.
3. try to select points.
4. change the world space in the bottom right.
5. Try with paint brush

Expected behavior:

selected points should match the mouse position

Actual behavior:

doesn't always.

Versions

OS X 10.12 with QT 5.12 latest master, 2.4.4

[jessdtate]

some datasets are more prone than others. Here is an example: /home/sci/jess/test_Seg3D/FLASH.nrrd