Factor out isCtrlOrCmdKeyEvent, use that in TagPanel

as opposed to the incorrect ctrl || meta

src/Keyboard.js

@@ -0,0 +1,70 @@
+/*
+Copyright 2016 OpenMarket Ltd
+Copyright 2017 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/* a selection of key codes, as used in KeyboardEvent.keyCode */
+export const KeyCode = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    ESCAPE: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+    KEY_A: 65,
+    KEY_B: 66,
+    KEY_C: 67,
+    KEY_D: 68,
+    KEY_E: 69,
+    KEY_F: 70,
+    KEY_G: 71,
+    KEY_H: 72,
+    KEY_I: 73,
+    KEY_J: 74,
+    KEY_K: 75,
+    KEY_L: 76,
+    KEY_M: 77,
+    KEY_N: 78,
+    KEY_O: 79,
+    KEY_P: 80,
+    KEY_Q: 81,
+    KEY_R: 82,
+    KEY_S: 83,
+    KEY_T: 84,
+    KEY_U: 85,
+    KEY_V: 86,
+    KEY_W: 87,
+    KEY_X: 88,
+    KEY_Y: 89,
+    KEY_Z: 90,
+};
+
+export function isCtrlOrCmdKeyEvent(ev) {
+    const isMac = navigator.platform.toUpperCase().indexOf('MAC') >= 0;
+    if (isMac) {
+        return ev.metaKey && !ev.altKey && !ev.ctrlKey && !ev.shiftKey;
+    } else {
+        return ev.ctrlKey && !ev.altKey && !ev.metaKey && !ev.shiftKey;
+    }
+}