fix window resize
- 1c564b3c: initial-texture-{width,height} needs to be updated for intersections to work correctly.
- 7e438d2d: Started writing a test and noticed we use pointer pose in intersection test, but pointer pose is updated after intersection test.
- e62049b1: Test for scene window intersections makes use of internal functions of XrdClient, to test the entire "intersection stack". It might make sense to factor some of this out into a common "test framework" file.