Reverse active take zoom/display issue

[Paul Eye]

There's a zoom/display bug when using reverse active take on an item. Simple steps to reproduce:

- insert file
- zoom in all the way
- set ruler to "samples" (for the sake of visual feedback)
- item is visually aligned to samples
- right click on item -> item settings -> reverse active take
- item isn't visually aligned to samples and changes depending on zoom level

LICEcap zooming in and out, item already reversed:



Double checked that:
- File and project sample rate match
- Snap to project sample rate is on
- Item playback rate is 1.0

REAPER 5.961 x64
Win10 Pro x64 v1803
GTX 970, driver v411.70