Extract common functionality into a new BaseTreeViewer._finishRendering
method
#12796
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Note how the end of the
{PDFOutlineViewer, PDFAttachmentViewer, PDFLayerViewer}.render
methods share almost identical code, hence we can reduce some duplication by introducing the newBaseTreeViewer
helper method here.Furthermore, setting
this._lastToggleIsShow
can be made ever so slightly more efficient, since we don't care about the number of ".treeItemsHidden"-classes but only want to know if at least one exists.