Bug 30630 nested source folders: unclear error message
20030129 create a jproject, a source folder s1 and a nested in it source folder s2 delete s1 open the 'new' wizard and try creating a source folder s1 the error message is very long and compilicated while it should be a simple warning saying 'You have a folder s1 - I will turn it into a source folder fo you' (and then it could automagically add excelusion filter so that s2 is still a source folder)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
res= openNewSourceContainerDialog(elem);
		}
		
		if (res != null) {
			fFoldersList.replaceElement(elem, res);
		}
	}
	private void editAttributeEntry(CPListElementAttribute elem) {
		String key= elem.getKey();
		if (key.equals(CPListElement.OUTPUT)) {
			CPListElement selElement= (CPListElement) elem.getParent();
			OutputLocationDialog dialog= new OutputLocationDialog(getShell(), selElement);
			if (dialog.open() == OutputLocationDialog.OK) {
				selElement.setAttribute(CPListElement.OUTPUT, dialog.getOutputLocation());
				fFoldersList.refresh();
				fClassPathList.dialogFieldChanged(); 
			}
		} else if (key.equals(CPListElement.EXCLUSION)) {
			CPListElement selElement= (CPListElement) elem.getParent();
			ExclusionPatternDialog dialog= new ExclusionPatternDialog(getShell(), selElement);
			if (dialog.open() == OutputLocationDialog.OK) {
				selElement.setAttribute(CPListElement.EXCLUSION, dialog.getExclusionPattern());
				fFoldersList.refresh();
				fClassPathList.dialogFieldChanged(); 
			}		
		}
	}
	
	protected void sourcePageSelectionChanged(DialogField field) {
		List selected= fFoldersList.getSelectedElements();