[212_2]: Fix hyperlinks unclickable in beamer PDF export

TeXmacs/tests/tmu/212_2_beamer_hlink.tmu

@@ -0,0 +1,25 @@
+<TMU|<tuple|1.0.2|1.2.8-rc1>>
+
+<style|<tuple|beamer|no-page-numbers>>
+
+<\body>
+  <screens|<\shown>
+    Test slide with hyperlinks
+
+    <hlink|Mogan Research|https://mogan.app>
+
+    <hlink|GNU GPL v3|https://www.gnu.org/licenses/gpl-3.0.html>
+  </shown>|<\shown>
+    Second slide
+
+    <hlink|GitHub|https://github.com>
+  </shown>>
+</body>
+
+<\initial>
+  <\collection>
+    <associate|font-base-size|24>
+    <associate|page-medium|beamer>
+    <associate|page-screen-margin|false>
+  </collection>
+</initial>

devel/212_2.md

@@ -0,0 +1,27 @@
+# 212_2: Fix hyperlinks unclickable in beamer PDF export
+
+## Issue
+Hyperlinks become invalid and unclickable after exporting a slideshow/beamer presentation to PDF. (Issue #2843)
+
+## How to test
+1. Open `TeXmacs/tests/tmu/212_2_beamer_hlink.tmu`
+2. Export as PDF via File → Export → Pdf...
+3. Open the exported PDF and verify all hyperlinks are clickable
+
+## 2026/02/24
+
+### What
+Fixed hyperlinks (`hlink`) becoming unclickable after exporting a beamer presentation to PDF.
+
+### Why
+When exporting a beamer presentation to PDF, `wrapped-print-to-file` creates a temporary buffer copy, calls `dynamic-make-slides` to expand slides, then calls `print-to-file` (→ C++ `print_doc`).
+
+In `print_doc`, `typeset_as_document` creates a typesetter, typesets the document (registering link/ID observers in global tables), then immediately destroys the typesetter — which unregisters all link observers.
+
+During the rendering loop that follows, `display_links` (called by `box_rep::redraw` for non-screen renderers) queries these global link tables via `get_ids()`/`get_links()`. But the tables are now empty because the typesetter was already destroyed. So `ren->href()` is never called, and no link annotations appear in the PDF.
+
+For regular documents, the screen-display typesetter from the original buffer is still alive with its link registrations. But for beamer export, the temporary buffer copy has no prior typesetting history — hence unclickable hyperlinks.
+
+### How
+- Inlined `typeset_as_document` in `print_doc` and deferred `delete_typesetter` until after the rendering loop, so link registrations persist through `display_links` calls
+- Added a free-function `typeset(typesetter)` wrapper in `typesetter.hpp`/`typesetter.cpp` to avoid needing the `typesetter_rep` class definition in `edit_main.cpp`

src/Edit/Editor/edit_main.cpp

@@ -220,8 +220,21 @@ edit_main_rep::print_doc (url name, bool conform, int first, int last) {
   }
 
   // Typeset pages for printing
+  // NOTE: We inline typeset_as_document here and defer delete_typesetter
+  // until after the rendering loop. This is necessary because display_links
+  // (called during redraw for non-screen renderers) queries global link
+  // tables via get_ids/get_links. These tables are populated by the
+  // typesetter during typesetting and cleared when the typesetter is
+  // destroyed. If we destroy the typesetter before rendering (as
+  // typeset_as_document does), hyperlinks in the PDF become unclickable
+  // because the link registrations are already gone. This particularly
+  // affects beamer/slideshow export where a temporary buffer copy has no
+  // prior link registrations from screen display. (See issue #2843)
 
-  box the_box= typeset_as_document (env, subtree (et, rp), reverse (rp));
+  env->style_init_env ();
+  env->update ();
+  typesetter ttt    = new_typesetter (env, subtree (et, rp), reverse (rp));
+  box        the_box= ::typeset (ttt);
 
   // Determine parameters for printer
 
@@ -267,6 +280,7 @@ edit_main_rep::print_doc (url name, bool conform, int first, int last) {
     }
   }
   tm_delete (ren);
+  delete_typesetter (ttt);
 }
 
 void

src/Typeset/Bridge/typesetter.cpp

@@ -300,6 +300,11 @@ exec_until (typesetter ttt, path p) {
   ttt->br->exec_until (p);
 }
 
+box
+typeset (typesetter ttt) {
+  return ttt->typeset ();
+}
+
 box
 typeset (typesetter ttt, SI& x1, SI& y1, SI& x2, SI& y2) {
   return ttt->typeset (x1, y1, x2, y2);

src/Typeset/typesetter.hpp

@@ -31,6 +31,7 @@ void notify_assign_node (typesetter ttt, path p, tree_label op);
 void notify_insert_node (typesetter ttt, path p, tree t);
 void notify_remove_node (typesetter ttt, path p);
 void exec_until (typesetter ttt, path p);
+box  typeset (typesetter ttt);
 box  typeset (typesetter ttt, SI& x1, SI& y1, SI& x2, SI& y2);
 
 box        typeset_as_concat (edit_env env, tree t, path ip);