Jonas Jenwald 03f10739d8 Extract common functionality into a new BaseTreeViewer._finishRendering method
Note how the end of the `{PDFOutlineViewer, PDFAttachmentViewer, PDFLayerViewer}.render` methods share *almost* identical code, hence we can reduce some duplication by introducing the new `BaseTreeViewer` 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.
2020-12-30 13:48:58 +01:00
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2020-12-26 13:04:32 +01:00