feat: make modal more restrictive and more Esc freedom

This makes it so that you can no longer interact with the search bar
or the results or anything while the modal is open. That's why it's a "modal" and not a "dialog".

It also makes it so that you can now always press Esc to return to the results or the main page.
Previously this was only possible when the search field was active.

Author: r00ster91

lib/docs/main.js

@@ -3148,6 +3148,22 @@ var zigAnalysis;
     domSearch.blur();
   }
 
+  function onEscape(ev) {
+    if (!domHelpModal.classList.contains("hidden")) {
+      domHelpModal.classList.add("hidden");
+      ev.preventDefault();
+      ev.stopPropagation();
+    } else {
+      domSearch.value = "";
+      domSearch.blur();
+      domSearchPlaceholder.classList.remove("hidden");
+      curSearchIndex = -1;
+      ev.preventDefault();
+      ev.stopPropagation();
+      startSearch();
+    }
+  }
+
   function onSearchKeyDown(ev) {
     switch (getKeyString(ev)) {
       case "Enter":
@@ -3164,13 +3180,8 @@ var zigAnalysis;
         ev.stopPropagation();
         return;
       case "Esc":
-        domSearch.value = "";
-        domSearch.blur();
-        curSearchIndex = -1;
-        ev.preventDefault();
-        ev.stopPropagation();
-        startSearch();
-        return;
+        onEscape(ev);
+        return
       case "Up":
         moveSearchCursor(-1);
         ev.preventDefault();
@@ -3245,19 +3256,18 @@ var zigAnalysis;
   function onWindowKeyDown(ev) {
     switch (getKeyString(ev)) {
       case "Esc":
-        if (!domHelpModal.classList.contains("hidden")) {
-          domHelpModal.classList.add("hidden");
+        onEscape(ev);
+        break;
+      case "s":
+        if (domHelpModal.classList.contains("hidden")) {
+          // TODO: scroll the page to the very top
+          domSearch.focus();
+          domSearch.select();
           ev.preventDefault();
           ev.stopPropagation();
+          startAsyncSearch();
         }
         break;
-      case "s":
-        domSearch.focus();
-        domSearch.select();
-        ev.preventDefault();
-        ev.stopPropagation();
-        startAsyncSearch();
-        break;
       case "?":
         ev.preventDefault();
         ev.stopPropagation();
@@ -3273,6 +3283,7 @@ var zigAnalysis;
     domHelpModal.style.top =
       window.innerHeight / 2 - domHelpModal.clientHeight / 2 + "px";
     domHelpModal.focus();
+    domSearch.blur();
   }
 
   function clearAsyncSearch() {