fix: Remove unused <use> elements when deleting empty symbols (issue 1765). #2051
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When removeEmptyContainers removes a symbol referenced by
<use>, the stray<use>s were being left in the SVG, though they no longer reference a valid element. This PR modifies removeEmptyContainers to also remove the dangling<use>elements.Closes #1765, closes #1618, closes #1194.