Fix AltGr for a few more keys in IE and Edge

Some keys apparently send 'Unidentified' rather than an unshifted value.
Make sure those are also handled. Examples are \ and | on a Swedish
keyboard.

kasmweb/core/input/util.js

@@ -108,9 +108,16 @@ export function getKey(evt) {
             return 'Delete';
         }
 
-        // IE and Edge have broken handling of AltGraph so we cannot
-        // trust them for printable characters
-        if ((evt.key.length !== 1) || (!browser.isIE() && !browser.isEdge())) {
+        // IE and Edge need special handling, but for everyone else we
+        // can trust the value provided
+        if (!browser.isIE() && !browser.isEdge()) {
+            return evt.key;
+        }
+
+        // IE and Edge have broken handling of AltGraph so we can only
+        // trust them for non-printable characters (and unfortunately
+        // they also specify 'Unidentified' for some problem keys)
+        if ((evt.key.length !== 1) && (evt.key !== 'Unidentified')) {
             return evt.key;
         }
     }

kasmweb/tests/test.helper.js

@@ -169,6 +169,16 @@ describe('Helpers', function () {
                 window.navigator.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393";
                 expect(KeyboardUtil.getKey({key: 'Shift'})).to.be.equal('Shift');
             });
+            it('should allow printable character key with charCode on IE', function () {
+                window.navigator.userAgent = "Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko";
+                expect(KeyboardUtil.getKey({key: 'a', charCode: 0x61})).to.be.equal('a');
+                expect(KeyboardUtil.getKey({key: 'Unidentified', charCode: 0x61})).to.be.equal('a');
+            });
+            it('should allow printable character key with charCode on Edge', function () {
+                window.navigator.userAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.79 Safari/537.36 Edge/14.14393";
+                expect(KeyboardUtil.getKey({key: 'a', charCode: 0x61})).to.be.equal('a');
+                expect(KeyboardUtil.getKey({key: 'Unidentified', charCode: 0x61})).to.be.equal('a');
+            });
         });
     });