a70a790e2a
Before this patch, the first call to `Document::ScrollToRef()` would attempt to find all text directives in the document, and, if found, highlight + scroll to them. Then, it would clear the list of uninvoked directives. However, `ScrollToRef()` is called multiple times during a page load, and the DOM can change (e.g. if `DOMContentLoaded` does some changes). This patch fixes this by only removing the text directives which were found in the document from the list of uninvoked directives. This way, subsequent calls to `ScrollToRef()` would ensure that all text directives are highlighted, and the first text directive is scrolled to. Additionally, all remaining uninvoked text directives at the end of a page load (ie. text directives that are not on the page) are cleared. A test was added as well. Differential Revision: https://phabricator.services.mozilla.com/D211260
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