ID 146580 - RAM Cache is cleared when Viewer gamma or gain are adjusted

Problem summary
Updating the gain or gamma values in the Viewer resets clears the playback cache.

Customer reported version
nuke.n/a

Customer reported platform

Steps to reproduce

1. Open Nuke and load some footage.

2. Play the footage in the Viewer and notice how each frame gets marked as green in the timeline as it gets cached.

3. While the footage is playing change the gain or gamma values

Result: The playback cache gets reset and the caching starts again each time the gain or gamma values are changed.

Workaround
Unknown.

Reproduced by support
Reproduced on Linux RHEL 6 and Windows 7 in Nuke 9.0v8 and 10.0v4.

Expected behaviour
Changing the gain or gamma values resets the playback cache.

Actual behaviour
The playback cache should not be affected when changing gain or gamma in the Viewer.

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