add delete support and to keyboard shortcuts

src/Keyboard.ts

@@ -22,6 +22,7 @@ export const Key = {
     PAGE_UP: "PageUp",
     PAGE_DOWN: "PageDown",
     BACKSPACE: "Backspace",
+    DELETE: "Delete",
     ARROW_UP: "ArrowUp",
     ARROW_DOWN: "ArrowDown",
     ARROW_LEFT: "ArrowLeft",

src/components/views/rooms/BasicMessageComposer.js

@@ -447,7 +447,7 @@ export default class BasicMessageEditor extends React.Component {
             } else if (event.key === Key.TAB) {
                 this._tabCompleteName();
                 handled = true;
-            } else if (event.key === Key.BACKSPACE) {
+            } else if (event.key === Key.BACKSPACE || Key.DELETE) {
                 this._formatBarRef.hide();
             }
         }