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

[gadenbuie]

For #1326

Dynamically-rendered outputs (e.g. uiOutput()) inside a popover() or tooltip() with no title failed to render — the output stayed stuck "recalculating" and never appeared. (With a title, the same output renders fine.)

Cause

This is an upstream Shiny regression introduced in shiny 1.14.0 (rstudio/shiny#4388). Shiny's IntersectionObserver-based visibility detection ends up targeting bslib's boxless display:contents popover/tooltip wrapper, so it never fires when the popover opens. The output's ResizeObserver is then the only trigger left, and it only fires if the output's box size changes — which, in a title-less popover, it doesn't (the empty output measures 0×0 both before and after opening).

Full root-cause analysis and the proposed Shiny-side fix are tracked in rstudio/shiny#4406.

Fix (temporary workaround)

Add a tiny CSS rule giving shiny outputs inside popovers/tooltips a min-width: 1px, which guarantees a non-zero box so the ResizeObserver fires when the popover opens. Once the output has content it becomes display:contents, so the rule is a no-op — no visual impact.

• New partial inst/components/scss/tooltip-popover.scss
• Regenerated inst/components/dist/components.css via tools/compile_component_sass.R
• NEWS.md entry

This is a workaround pending the upstream Shiny fix (rstudio/shiny#4406); once that ships, this rule can be removed.

[gadenbuie]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved in c19864e. The two conflicts were:

• R/sysdata.rda (binary): used origin/main's version — our PR made no data changes, so main's version (which includes the offcanvas feature data) is correct.
• inst/components/dist/components.css (generated): used origin/main's version as the base and appended our :is(.popover, .tooltip) .shiny-html-output{min-width:1px} rule; NEWS.md auto-merged cleanly.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}