Fix button not losing focus after selecting a menu item in IE

PickerMenu.js

@@ -1,5 +1,5 @@
 // Menu-like Picker variant with keyboard control
-// Version 2020-06-22
+// Version 2020-06-30
 // License: LGPLv3.0+
 // (c) Vitaliy Filippov 2020+
 
@@ -62,6 +62,10 @@ export default class PickerMenu extends Picker
     {
         if (!this.props.keepOnClick)
         {
+            if (this.input)
+            {
+                this.input.blur();
+            }
             this.blur();
         }
         else if (ev)