@Override public void writeExternal(Element element) throws WriteExternalException { PsiDocumentManager.getInstance(myProject).commitAllDocuments(); if (myPsiElements.isEmpty() && myRangeMarkers.isEmpty() && mySerializedElements.isEmpty()) { throw new WriteExternalException(); } if (mySerializedElements.isEmpty()) { for (SmartPsiElementPointer<PsiElement> ptr : myPsiElements) { PsiElement psiElement = ptr.getElement(); if (psiElement == null || !psiElement.isValid()) { continue; } FoldingInfo fi = psiElement.getUserData(FOLDING_INFO_KEY); boolean state = fi != null && fi.expanded; String signature = FoldingPolicy.getSignature(psiElement); if (signature == null) { continue; } PsiFile containingFile = psiElement.getContainingFile(); PsiElement restoredElement = FoldingPolicy.restoreBySignature(containingFile, signature); if (!psiElement.equals(restoredElement)) { StringBuilder trace = new StringBuilder(); PsiElement restoredAgain = FoldingPolicy.restoreBySignature(containingFile, signature, trace); LOG.error( "element: " + psiElement + "(" + psiElement.getText() + "); restoredElement: " + restoredElement + "; signature: '" + signature + "'; file: " + containingFile + "; injected: " + InjectedLanguageManager.getInstance(myProject) .isInjectedFragment(containingFile) + "; languages: " + containingFile.getViewProvider().getLanguages() + "; restored again: " + restoredAgain + "; restore produces same results: " + (restoredAgain == restoredElement) + "; trace:\n" + trace); } Element e = new Element(ELEMENT_TAG); e.setAttribute(SIGNATURE_ATT, signature); e.setAttribute(EXPANDED_ATT, Boolean.toString(state)); element.addContent(e); } } else { // get back postponed state (before folding initialization) for (SerializedPsiElement entry : mySerializedElements) { Element e = new Element(ELEMENT_TAG); e.setAttribute(SIGNATURE_ATT, entry.mySerializedElement); e.setAttribute(EXPANDED_ATT, Boolean.toString(entry.myFoldingInfo.getExpanded())); element.addContent(e); } } String date = null; for (RangeMarker marker : myRangeMarkers) { FoldingInfo fi = marker.getUserData(FOLDING_INFO_KEY); boolean state = fi != null && fi.expanded; Element e = new Element(MARKER_TAG); if (date == null) { date = getTimeStamp(); } if (date.isEmpty()) { continue; } e.setAttribute(DATE_ATT, date); e.setAttribute(EXPANDED_ATT, Boolean.toString(state)); String signature = Integer.valueOf(marker.getStartOffset()) + ":" + Integer.valueOf(marker.getEndOffset()); e.setAttribute(SIGNATURE_ATT, signature); String placeHolderText = fi == null ? DEFAULT_PLACEHOLDER : fi.placeHolder; e.setAttribute(PLACEHOLDER_ATT, placeHolderText); element.addContent(e); } }