revealjs - lift Figure.fragment to surrounding div

news/changelog-1.8.md

@@ -1,3 +1,13 @@
 All changes included in 1.8:
 
+## Formats
 
+### `revealjs`
+
+- ([#12598](https://github.com/quarto-dev/quarto-cli/pull/12598)): Ensure `.fragment` on an image with caption applies to whole figure.
+
+## Projects
+
+### `website`
+
+- ([#12551](https://github.com/quarto-dev/quarto-cli/pull/12551)): Improve warning issued when `aliases` would overwrite an existing document.

src/project/types/website/website-aliases.ts

@@ -106,10 +106,17 @@ export async function updateAliases(
 
     // Write the redirect file
     if (allOutputFiles.find((outputFile) => outputFile === targetFile)) {
-      // Do not, this is the same name as an output file!
-      warning(
-        `Aliases that you have created would overwrite the output file ${targetFile}. The aliases file was not created.`,
-      );
+      for (
+        const offendingAlias of targetHrefs.filter(
+          (targetHref) =>
+            targetHref.href ===
+              relative(dirname(targetHref.outputFile), targetFile),
+        )
+      ) {
+        warning(
+          `Requested alias ${targetFile} -> ${offendingAlias.outputFile} would overwrite the target. Skipping.`,
+        );
+      }
     } else {
       // Write, this is a safe file
       writeMultipleRedirectPage(targetFile, redirects);

src/resources/filters/layout/pandoc3_figure.lua

@@ -68,11 +68,25 @@ function render_pandoc3_figure()
     return {
       traverse = "topdown",
       Figure = function(figure)
+        local has_fragment = false
+        figure.content = _quarto.ast.walk(figure.content, {
+          Image = function(img)
+            if img.classes:includes("fragment") then
+              has_fragment = true
+              img.classes = img.classes:filter(function(c) return c ~= "fragment" end)
+              return img
+            end
+          end
+        })
+
         local result = html_handle_linked_image(figure)
-        if result ~= nil then
-          return result
+        if result == nil then
+          result = html_handle_image(figure)
+        end
+        if has_fragment then
+          result = pandoc.Div(result, pandoc.Attr("", {"fragment"}, {}))
         end
-        return html_handle_image(figure)
+        return result
       end
     }
   elseif _quarto.format.isLatexOutput() then

tests/docs/smoke-all/2025/04/23/issue-12598.qmd

@@ -0,0 +1,13 @@
+---
+format: revealjs
+_quarto:
+  tests:
+    revealjs:
+      ensureHtmlElements:
+        - ["div.fragment"]
+        - []
+---
+
+## Slide title
+
+![caption](image.jpg){.fragment}