fix(removeEmptyContainers): skip if filter is applied via styles as well #2089
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Fixes a bug where we were too eager to remove empty containers.
We already had logic to skip removing empty containers if it had the
filter
attribute, which is needed to apply a filter to the whole area. However, thefilter
can also be defined through CSS. We did not properly handle this case, and treated the node as if it had nofilter
at all.This computes the styles and checks the stylesheet as well. (We also move the logic down to avoid computing the styles eagerly.)