Fix mistake in Form.addInput

TL;DR afterIndex was not being set correctly.

1 files changed, 6 insertions, 1 deletions

diff --git a/ui/DisplayElement.js b/ui/DisplayElement.js
index 8a2aa71..9498487 100644
--- a/ui/DisplayElement.js
+++ b/ui/DisplayElement.js
@@ -87,7 +87,12 @@ module.exports = class DisplayElement extends EventEmitter {
     }
 
     child.parent = this
-    this.children.splice(afterIndex, 0, child)
+
+    if (afterIndex === this.children.length) {
+      this.children.push(child)
+    } else {
+      this.children.splice(afterIndex, 0, child)
+    }
 
     if (fixLayout) {
       child.fixLayout()