fix: mouse click to select item for IE11 (#172)

* fix: mouse click to select item for IE11

* chore: updated deps

Author: jukben

package.json

@@ -61,7 +61,7 @@
     "flow-bin": "^0.60.1",
     "html-webpack-plugin": "3.2.0",
     "husky": "1.2.1",
-    "jest": "23.6.0",
+    "jest": "24.8.0",
     "lint-staged": "8.1.0",
     "prettier": "1.15.3",
     "react": "16.6.0",
@@ -78,7 +78,7 @@
     "wait-on": "^3.2.0",
     "webpack": "4.27.1",
     "webpack-cli": "3.1.2",
-    "webpack-dev-server": "3.1.14"
+    "webpack-dev-server": "3.7.2"
   },
   "peerDependencies": {
     "prop-types": "^15.0.0",

src/Textarea.jsx

@@ -881,7 +881,12 @@ class ReactTextareaAutocomplete extends React.Component<
     // If this is a click: e.target is the textarea, and e.relatedTarget is the thing
     // that was actually clicked. If we clicked inside the autoselect dropdown, then
     // that's not a blur, from the autoselect's point of view, so then do nothing.
-    const el = e.relatedTarget;
+    let el = e.relatedTarget;
+    // IE11 doesn't know about `relatedTarget` // https://stackoverflow.com/a/49325196/2719917
+    if (el === null) {
+      el = document.activeElement;
+    }
+
     if (
       this.dropdownRef &&
       el instanceof Node &&