fix(flow-mobile): Increase specificity of fill-modifying rule

[gadenbuie]

Counterpart to rstudio/htmltools#425. Technically that PR fixes the same issue (and contains further details), but we might not want a hard depdendency on a new version of htmltools.

No news entry because this fixes a not-yet-released bug.

Example app

library(shiny)
pkgload::load_all()

ui <- page_fillable(
  layout_columns(
    col_widths = c(12, 6, 6),
    row_heights = breakpoints(
      xs = c(7, 1.5, 1.5),
      sm = c(70, 30)
    ),
    card("Chart 1"),
    navset_card_tab(
      nav_panel("Chart 2"),
      nav_panel("Chart 3")
    ),
    card("Chart 4")
  )
)

server <- function(input, output, session) {

}

shinyApp(ui, server)

[cpsievert]

I wouldn't be entirely opposed to just requiring the latest htmltools, but I don't mind either way

[gadenbuie]

I wouldn't be entirely opposed to just requiring the latest htmltools, but I don't mind either way

We already require the latest htmltools release in bslib, so I think bumping the version requirement is the best way forward here. Will submit a PR shortly