Bug 34221 [code manipulation] Comment and uncomment code
The same key ctrl-/ should be used for both comments and uncommenting code. If code isn't commented ctrl-/ will comment. If already commented ctrl-/ will uncomment it. If two levels of comments, uncomment the first, then the second. For example //this is a comment ////this is a second comment hitting ctrl-/ would result in this is a comment //this is a second comment
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
} catch (CoreException x) {
			ErrorDialog.openError(shell, JavaEditorMessages.getString("CompilationUnitEditor.error.saving.title2"), JavaEditorMessages.getString("CompilationUnitEditor.error.saving.message2"), x.getStatus()); 
		} finally {
			provider.changed(newInput);
			if (success)
				setInput(newInput);
		}
		
		if (progressMonitor != null)
			progressMonitor.setCanceled(!success);
	}
	
	/*
	 * @see AbstractTextEditor#doSetInput(IEditorInput)
	 */
	protected void doSetInput(IEditorInput input) throws CoreException {
		super.doSetInput(input);
		configureTabConverter();
	}
	private void configureTabConverter() {
		if (fTabConverter != null) {
			IDocumentProvider provider= getDocumentProvider();
			if (provider instanceof ICompilationUnitDocumentProvider) {
				ICompilationUnitDocumentProvider cup= (ICompilationUnitDocumentProvider) provider;
				fTabConverter.setLineTracker(cup.createLineTracker(getEditorInput()));
			}
		}
	}
	
	private int getTabSize() {