Bug 1597707 - Do not dispatch SELECT_ALL selection action if the input is empty or all the text is already selected. r=esawin

Do not dispatch SELECT_ALL selection action if the input is empty or all the text is already selected.

Differential Revision: https://phabricator.services.mozilla.com/D53828

--HG--
extra : moz-landing-system : lando

mobile/android/chrome/geckoview/GeckoViewSelectionActionChild.js

@@ -70,7 +70,18 @@ class GeckoViewSelectionActionChild extends GeckoViewChildModule {
       },
       {
         id: "org.mozilla.geckoview.SELECT_ALL",
-        predicate: e => e.reason !== "longpressonemptycontent",
+        predicate: e => {
+          if (e.reason === "longpressonemptycontent") {
+            return false;
+          }
+          if (e.target && e.target.activeElement) {
+            const value = e.target.activeElement.value;
+            // Do not show SELECT_ALL if the input is empty
+            // or all the input text is already selected.
+            return value !== "" && value !== e.selectedTextContent;
+          }
+          return true;
+        },
         perform: e => docShell.doCommand("cmd_selectAll"),
       },
     ];