Hide the sidebar when collapsed to prevent browser search to find text from it

src/front-end/css/chrome.css

@@ -530,7 +530,6 @@ html:not(.sidebar-resizing) .sidebar {
 /* sidebar-hidden */
 #sidebar-toggle-anchor:not(:checked) ~ .sidebar {
     transform: translateX(calc(0px - var(--sidebar-width) - var(--sidebar-resize-indicator-width)));
-    z-index: -1;
 }
 [dir=rtl] #sidebar-toggle-anchor:not(:checked) ~ .sidebar {
     transform: translateX(calc(var(--sidebar-width) + var(--sidebar-resize-indicator-width)));

src/front-end/js/book.js

@@ -521,10 +521,30 @@ aria-label="Show hidden lines"></button>';
     const sidebarToggleButton = document.getElementById('sidebar-toggle');
     const sidebarToggleAnchor = document.getElementById('sidebar-toggle-anchor');
     const sidebarResizeHandle = document.getElementById('sidebar-resize-handle');
+    const sidebarCheckbox = document.getElementById('sidebar-toggle-anchor');
     let firstContact = null;
 
+
+    /* Because we cannot change the `display` using only CSS after/before the transition, we
+       need JS to do it. We change the display to prevent the browsers search to find text inside
+       the collapsed sidebar. */
+    if (!document.documentElement.classList.contains('sidebar-visible')) {
+        sidebar.style.display = 'none';
+    }
+    sidebar.addEventListener('transitionend', () => {
+        /* We only change the display to "none" if we're collapsing the sidebar. */
+        if (!sidebarCheckbox.checked) {
+            sidebar.style.display = 'none';
+        }
+    });
+    sidebarToggleButton.addEventListener('click', () => {
+        /* To allow the sidebar expansion animation, we first need to put back the display. */
+        if (!sidebarCheckbox.checked) {
+            sidebar.style.display = '';
+        }
+    });
+
     function showSidebar() {
-        body.classList.remove('sidebar-hidden');
         body.classList.add('sidebar-visible');
         Array.from(sidebarLinks).forEach(function(link) {
             link.setAttribute('tabIndex', 0);
@@ -540,7 +560,6 @@ aria-label="Show hidden lines"></button>';
 
     function hideSidebar() {
         body.classList.remove('sidebar-visible');
-        body.classList.add('sidebar-hidden');
         Array.from(sidebarLinks).forEach(function(link) {
             link.setAttribute('tabIndex', -1);
         });
@@ -579,7 +598,7 @@ aria-label="Show hidden lines"></button>';
         if (pos < 20) {
             hideSidebar();
         } else {
-            if (body.classList.contains('sidebar-hidden')) {
+            if (!body.classList.contains('sidebar-visible')) {
                 showSidebar();
             }
             pos = Math.min(pos, window.innerWidth - 100);
@@ -765,7 +784,7 @@ aria-label="Show hidden lines"></button>';
         let scrollTop = document.scrollingElement.scrollTop;
         let prevScrollTop = scrollTop;
         const minMenuY = -menu.clientHeight - 50;
-        // When the script loads, the page can be at any scroll (e.g. if you reforesh it).
+        // When the script loads, the page can be at any scroll (e.g. if you refresh it).
         menu.style.top = scrollTop + 'px';
         // Same as parseInt(menu.style.top.slice(0, -2), but faster
         let topCache = menu.style.top.slice(0, -2);

src/front-end/templates/index.hbs

@@ -117,9 +117,11 @@
             } else {
                 sidebar = 'hidden';
             }
-            sidebar_toggle.checked = sidebar === 'visible';
-            html.classList.remove('sidebar-visible');
-            html.classList.add("sidebar-" + sidebar);
+            if (sidebar === 'visible') {
+                sidebar_toggle.checked = true;
+            } else {
+                html.classList.remove('sidebar-visible');
+            }
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">

tests/gui/sidebar.goml

@@ -12,32 +12,24 @@ define-function: (
     "hide-sidebar",
     [],
     block {
-        // The content should be "moved" to the right because of the sidebar.
-        assert-css: ("#sidebar", {"transform": "none"})
         assert-position: ("#page-wrapper", {"x": |content_indent|})
 
         // We now hide the sidebar.
         click: "#sidebar-toggle"
-        wait-for: "body.sidebar-hidden"
-        // `transform` is 0.3s so we need to wait a bit (0.5s) to ensure the animation is done.
-        wait-for: 5000
-        assert-css-false: ("#sidebar", {"transform": "none"})
-        // The page content should now be on the left.
-        assert-position: ("#page-wrapper", {"x": 0})
+        wait-for-css: ("#sidebar", {"display": "none"})
     },
 )
 
 define-function: (
     "show-sidebar",
     [],
     block {
-        // The page content should be on the left and the sidebar "moved out".
-        assert-css: ("#sidebar", {"transform": "matrix(1, 0, 0, 1, -308, 0)"})
+        assert-css: ("#sidebar", {"display": "none"})
         assert-position: ("#page-wrapper", {"x": 0})
 
         // We expand the sidebar.
         click: "#sidebar-toggle"
-        wait-for: "body.sidebar-visible"
+        wait-for-css-false: ("#sidebar", {"display": "none"})
         // `transform` is 0.3s so we need to wait a bit (0.5s) to ensure the animation is done.
         wait-for: 5000
         assert-css-false: ("#sidebar", {"transform": "matrix(1, 0, 0, 1, -308, 0)"})