fix(popover): render dynamic outputs in title-less popover/tooltip

NEWS.md

@@ -2,6 +2,8 @@
 
 ## Bug fixes
 
+* Fixed dynamically-rendered outputs (e.g. `uiOutput()`) failing to render inside a title-less `popover()` or `tooltip()`, caused by an upstream Shiny change. A temporary CSS workaround restores rendering. (#1326)
+
 * Fixed label-to-options spacing on `shiny::radioButtons()` and `shiny::checkboxGroupInput()` in Bootstrap 5, where a Shiny rule was overriding the bslib fix. (#1308)
 
 * Fixed the resize handle indicator position for `position = "right"` sidebars, which now correctly appears at the inner boundary of the sidebar handle. (#1322)

inst/components/scss/tooltip-popover.scss

@@ -0,0 +1,8 @@
+// Workaround for shiny #4388 (bslib #1326): a dynamically-rendered output in a
+// title-less popover/tooltip collapses to 0 width, so its ResizeObserver never
+// fires and it stays stuck "recalculating". A tiny min-width guarantees a
+// non-zero box so the observer fires. Remove once shiny's IntersectionObserver
+// handles display:contents wrappers.
+:is(.popover, .tooltip) .shiny-html-output {
+  min-width: 1px;
+}

inst/examples-shiny/code-editor/examples/r.r

@@ -21,7 +21,7 @@ result <- data %>%
   )
 
 # Create visualization with ggplot2
-plot_output = ggplot(result, aes(x = group, y = mean_value, fill = group)) +
+plot_output <- ggplot(result, aes(x = group, y = mean_value, fill = group)) +
   geom_col(alpha = 0.8, show.legend = FALSE) +
   labs(title = "Summary Statistics by Group", x = "Group", y = "Mean Value") +
   theme_minimal() +