Bug 1222583 - Negative url filtering for network monitor. r=vporof

devtools/client/netmonitor/netmonitor-view.js

@@ -1166,8 +1166,15 @@ RequestsMenuView.prototype = Heritage.extend(WidgetMethods, {
   isFreetextMatch: function({ attachment: { url } }, text) {
     let lowerCaseUrl = url.toLowerCase();
     let lowerCaseText = text.toLowerCase();
-    //no text is a positive match
-    return !text || lowerCaseUrl.includes(lowerCaseText);
+    let textLength = text.length;
+    // Support negative filtering
+    if (text.startsWith("-") && textLength > 1) {
+      lowerCaseText = lowerCaseText.substring(1, textLength);
+      return !lowerCaseUrl.includes(lowerCaseText);
+    } else {
+      //no text is a positive match
+      return !text || lowerCaseUrl.includes(lowerCaseText);
+    }
   },
 
   /**

devtools/client/netmonitor/test/browser_net_filter-01.js

@@ -123,6 +123,12 @@ function test() {
           setFreetextFilter("SAMPLE");
           return testContents([1, 1, 1, 0, 0, 0, 0, 0]);
         })
+        .then(() => {
+          // Test negative filtering (only show unmatched items)
+          EventUtils.sendMouseEvent({ type: "click" }, $("#requests-menu-filter-all-button"));
+          setFreetextFilter("-sample");
+          return testContents([0, 0, 0, 1, 1, 1, 1, 1]);
+        })
         // ...then combine multiple filters together.
         .then(() => {
           // Enable filtering for html and css; should show request of both type.