Display hide hint text when admonition is expanded (#59)

Author: gabalafou

sphinx_togglebutton/_static/togglebutton.css

@@ -66,7 +66,7 @@ button.toggle-button {
 
 /* Display the toggle hint on wide screens */
 @media (min-width: 768px) {
-    button.toggle-button.toggle-button-hidden:before {
+    button.toggle-button:before {
         content: attr(data-toggle-hint);  /* This will be filled in by JS */
         font-size: .8em;
         align-self: center;

sphinx_togglebutton/_static/togglebutton.js

@@ -100,9 +100,11 @@ var toggleHidden = (button) => {
   if (itemToToggle.classList.contains("toggle-hidden")) {
     itemToToggle.classList.remove("toggle-hidden");
     button.classList.remove("toggle-button-hidden");
+    button.dataset.toggleHint = toggleHintHide;
   } else {
     itemToToggle.classList.add("toggle-hidden");
     button.classList.add("toggle-button-hidden");
+    button.dataset.toggleHint = toggleHintShow;
   }
 }