Update heuristic logic for tab search

Author: rstanuwijaya

src/browser/components/urlbar/UrlbarMuxerUnifiedComplete-sys-mjs.patch

@@ -1,17 +1,13 @@
 diff --git a/browser/components/urlbar/UrlbarMuxerUnifiedComplete.sys.mjs b/browser/components/urlbar/UrlbarMuxerUnifiedComplete.sys.mjs
-index dcf1af43d62..17dbaaa66aa 100644
+index dcf1af43d62..116865b068a 100644
 --- a/browser/components/urlbar/UrlbarMuxerUnifiedComplete.sys.mjs
 +++ b/browser/components/urlbar/UrlbarMuxerUnifiedComplete.sys.mjs
-@@ -117,6 +117,21 @@ class MuxerUnifiedComplete extends UrlbarMuxer {
+@@ -117,6 +117,17 @@ class MuxerUnifiedComplete extends UrlbarMuxer {
        // When you add state, update _copyState() as necessary.
      };
 
-+    const allFromPlaces = unsortedResults.every(
-+      result => result.providerName === "Places"
-+    );
-+  
-+    // If all results are from "Places", sort by lastOpened
-+    if (allFromPlaces) {
++    let window = Services.wm.getMostRecentWindow("navigator:browser");
++    if (window && window.gURLBar && window.gURLBar.searchMode && window.gURLBar.searchMode.source === 4) {
 +      unsortedResults.sort((a, b) => {
 +        const lastOpenedA = a.payload?.lastOpened || 0;
 +        const lastOpenedB = b.payload?.lastOpened|| 0;
@@ -24,11 +20,3 @@ index dcf1af43d62..17dbaaa66aa 100644
      // Do the first pass over all results to build some state.
      for (let result of unsortedResults) {
        // Add each result to the appropriate `resultsByGroup` map.
-@@ -794,6 +807,7 @@ class MuxerUnifiedComplete extends UrlbarMuxer {
-     }
- 
-     if (result.providerName == lazy.UrlbarProviderTabToSearch.name) {
-+      return false;
-       // Discard the result if a tab-to-search result was added already.
-       if (!state.canAddTabToSearch) {
-         return false;