keyboard UI: Add Ctrl + k hotkey.

Fixes #8216
This commit binds the Ctrl + k to go to the search bar.

frontend_tests/node_tests/hotkey.js

@@ -94,6 +94,7 @@ function stubbing(func_name_to_stub, test_function) {
     assert.equal(map_press(106).name, 'vim_down'); // j
 
     assert.equal(map_down(219, false, true).name, 'escape');
+    assert.equal(map_down(75, false, true).name, 'search');
 
     // More negative tests.
     assert.equal(map_down(47), undefined);

static/js/hotkey.js

@@ -48,6 +48,7 @@ var keydown_unshift_mappings = {
 };
 
 var keydown_ctrl_mappings = {
+    75: {name: 'search', message_view_only: false}, // 'K'
     219: {name: 'escape', message_view_only: false}, // '['
 };
 

templates/zerver/app/keyboard_shortcuts.html

@@ -49,7 +49,7 @@
                     <td class="definition">{% trans %}All private messages{% endtrans %}</td>
                 </tr>
                 <tr>
-                    <td class="hotkey">/</td>
+                    <td class="hotkey">Ctrl + k, /</td>
                     <td class="definition">{% trans %}Initiate a search{% endtrans %}</td>
                 </tr>
                 <tr>
@@ -69,7 +69,7 @@
                     </tr>
                 </thead>
                 <tr>
-                    <td class="hotkey">/</td>
+                    <td class="hotkey">Ctrl + k, /</td>
                     <td class="definition">{% trans %}Initiate a search{% endtrans %}</td>
                 </tr>
                 <tr>

templates/zerver/help/keyboard-shortcuts.md

@@ -45,7 +45,7 @@ below, and add more to your repertoire as needed.
 
 ## Navigation
 
-* **Search messages**: `/`
+* **Search messages**: `/` or `Ctrl+k`
 
 * **Search streams**: `q`