Fix search input receiving keystrokes after escape dismiss in Safari (#2338)

Author: tmchow

src/pydata_sphinx_theme/assets/scripts/pydata-sphinx-theme.js

@@ -836,11 +836,25 @@ function setupMobileSidebarKeyboardHandlers() {
       event.preventDefault();
       event.stopPropagation();
 
+      // Save focus so we can restore it when the dialog closes
+      const previouslyFocused = document.activeElement;
+
       // When we open the dialog, we cut and paste the nodes and classes from
       // the widescreen sidebar into the dialog
       cutAndPasteNodesAndClasses(sidebar, dialog);
 
       dialog.showModal();
+
+      // Restore focus when dialog closes
+      dialog.addEventListener(
+        "close",
+        () => {
+          if (previouslyFocused && previouslyFocused.focus) {
+            previouslyFocused.focus();
+          }
+        },
+        { once: true },
+      );
     });
 
     // Listen for clicks on the backdrop in order to close the dialog