Suppress keyboard shortcuts while some elements are in focus

Otherwise you could trigger them by typing the appropriate
shortcut while inside the search bar, for example.

Change-Id: I0ebc3f9235814faac19ec364f185386d8e496f04

polygerrit-ui/app/elements/gr-change-list.html

@@ -84,6 +84,8 @@ limitations under the License.
       },
 
       _handleKey: function(e) {
+        if (util.shouldSupressKeyboardShortcut(e)) { return; }
+
         var len = (this.changes && this.changes.length) || 0;
         switch(e.detail.combo) {
           case 'j':

polygerrit-ui/app/elements/gr-change-view.html

@@ -213,6 +213,8 @@ limitations under the License.
       },
 
       _handleKey: function(e) {
+        if (util.shouldSupressKeyboardShortcut(e)) { return; }
+
         switch(e.detail.combo) {
           case 'a':
             this._showReplyField();

polygerrit-ui/app/elements/gr-diff-view.html

@@ -314,6 +314,8 @@ limitations under the License.
       },
 
       _handleKey: function(e) {
+        if (util.shouldSupressKeyboardShortcut(e)) { return; }
+
         switch(e.detail.combo) {
           case '[':
             this._navToFile(this._fileList, -1);

polygerrit-ui/app/scripts/util.js

@@ -38,3 +38,12 @@ util.escapeHTML = function(str) {
     return util.htmlEntityMap[s];
   });
 };
+
+util.shouldSupressKeyboardShortcut = function(e) {
+  var target = e.detail.keyboardEvent.target;
+  return target.tagName == 'INPUT' ||
+         target.tagName == 'TEXTAREA' ||
+         target.tagName == 'SELECT' ||
+         target.tagName == 'BUTTON' ||
+         target.tagName == 'A';
+};

polygerrit-ui/app/test/gr-change-list-test.html

@@ -22,6 +22,7 @@ limitations under the License.
 <script src="../../bower_components/web-component-tester/browser.js"></script>
 <script src="../../bower_components/page/page.js"></script>
 <script src="../scripts/fake-app.js"></script>
+<script src="../scripts/util.js"></script>
 
 <link rel="import" href="../../bower_components/iron-test-helpers/iron-test-helpers.html">
 <link rel="import" href="../elements/gr-change-list.html">

polygerrit-ui/app/test/gr-change-view-test.html

@@ -22,6 +22,7 @@ limitations under the License.
 <script src="../../bower_components/web-component-tester/browser.js"></script>
 <script src="../../bower_components/page/page.js"></script>
 <script src="../scripts/changes.js"></script>
+<script src="../scripts/util.js"></script>
 
 <link rel="import" href="../../bower_components/iron-test-helpers/iron-test-helpers.html">
 <link rel="import" href="../elements/gr-change-view.html">