Should header/footer of "navbarPage" always be wrapped in "column"?

[Dean Attali]

When using `navbarPage`, the header and footer are inserted inside an HTML "row". As a result of that, because bootstrap applies a -15px margin-left to rows, the header/footer content is misaligned with the content in tabs.

Bootstrap also says that "only columns may be immediate children of rows" (http://getbootstrap.com/css/#grid)

So I always wrap my header/footer arguments in a "column(12, ...)".  Since this seems to be mandatory, would it make sense to take care of that in shiny-core instead of us doing it manually? Or are there cases where it couldn't be right to auto-wrap the arguments in a column?

Example: the following is misaligned (and is "illegal" according to bootstrap")

runApp(shinyApp(

  ui = navbarPage(

    id = "test",

    title = "test",

    header = "this is a header",

    footer = "this is a footer",

    tabPanel("mytab", "this is a tab")

  ),

  server = function(input, output, session) {}

))

Replace footer/header with:

    header = column(12, "this is a header"),

    footer = column(12, "this is a footer"),