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96b58d1f07
This patch fixes a regression from https://hg.mozilla.org/mozilla-central/rev/31695984cfe2 (bug 1025709). That patch replaced the EnsureStyleRuleFor method on ElementTransitions and ElementAnimations with a common method in CommonElementAnimationData. ElementTransitions::EnsureStyleRuleFor would create a new style rule if there was no style rule (mStyleRule == nullptr) or if the refresh time was old (mStyleRuleRefreshTime != aRefreshTime). ElementAnimations::EnsureStyleRuleFor, however, would create a new style rule only if mStyleRuleRefreshTime was null or old since a null style rule may still be valid for animations (unlike transitions). If we bail as soon as we a null style rule we would never update mNeedsRefreshes when the animation finishes. The unified version of EnsureStyleRuleFor in CommonElementAnimationData adopted the behavior from ElementAnimations checking for a null or old mStyleRuleRefreshTime. However, nsTransitionManager::StyleContextChanged sets mStyleRule to nullptr to indicate that we need to generate a new style rule. This means that we will fail to create a style rule for the transition in some cases. This patch addresses this by making nsTransitionManager::StyleContextChanged set mStyleRuleRefreshTime to a null timestamp. Setting mStyleRule to nullptr is no longer necessary since EnsureStyleRuleFor will do this when necessary and nsTransitionManager::mStyleRule is only used after calling EnsureStyleRuleFor. |
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