Bug 63389 [projection] Do we need a folding region for the top-level type?
The Java editor is currently defining a folding region for the top-level type. I couldn't find a good use of this folding region and in particular it leads to some visual instability when hovering in the vertical rule in between methods. Therefore I suggest to not add this folding region.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/folding/DefaultJavaFoldingStructureProvider.java
int start= shift;
				while (true) {
					int token= scanner.getNextToken();
					start= shift + scanner.getCurrentTokenStartPosition();
					switch (token) {
						case ITerminalSymbols.TokenNameCOMMENT_JAVADOC:
						case ITerminalSymbols.TokenNameCOMMENT_BLOCK: {
							int end= shift + scanner.getCurrentTokenEndPosition() + 1;
							regions.add(new Region(start, end - start));
						}
						case ITerminalSymbols.TokenNameCOMMENT_LINE:
							continue;
					}
					break;
				}
				regions.add(new Region(start, shift + range.getLength() - start));
				if (regions.size() > 0) {
					IRegion[] result= new IRegion[regions.size()];
					regions.toArray(result);
					return result;
				}
			}
		} catch (JavaModelException e) {
		} catch (InvalidInputException e) {
		}
		return null;
	}
	private IRegion computeHeaderComment(IType type) throws JavaModelException {
		if (fCachedDocument == null)
			return null;