fa671fd0d54afa92f0e220aee5ba6ba86aef050e

Issue was caused by rare cases when camera move happens just after last sample was finished, this would lead to missing delay reset because render cycle will go to pause_cond.wait(). No reset will happen at this point because of some kind of optimization which checks whether camera is tagged for update and wouldn't do reset in this case. Talked to Brecht and seems this optimization is not actually needed and removing it will solve issue with frozen preview.
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