This method is added so that animation elements that fail conditional processing
tests can disable the corresponding timed element. Currently, this handling is
performed by the animation controller which simply skips sampling animations
that fail tests. However, this doesn't provide the correct behavior since
"skipped" animations can still have intervals that trigger syncbase dependencies
etc. Also, we still do milestone samples for "skipped" animations which can
lead to cases where we are in an inconsistent state.
This patch provides a method that will be used in subsequent patches to more
correctly remove the effects of a timed element.
To do this, this patch also factors out some common methods for clearing timing
state that can be shared with the Rewind method.
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https://developer.mozilla.org/en/Mozilla_Source_Code_Directory_Structure
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http://developer.mozilla.org/en/docs/Build_Documentation
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http://developer.mozilla.org/en/docs/Creating_a_patch
http://developer.mozilla.org/en/docs/Getting_your_patch_in_the_tree
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testing, may be buggy. Firefox nightlies, for example, can be found at:
ftp://ftp.mozilla.org/pub/firefox/nightly/latest-trunk/
- or -
http://nightly.mozilla.org/
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