Ignore Mouse0 keybinding.
Ignore Mouse0 keybinding.

--- a/KerbalEngineer/UIControls/SelectKeyBindPopup.cs
+++ b/KerbalEngineer/UIControls/SelectKeyBindPopup.cs
@@ -166,6 +166,12 @@
             for (int i = 0; i < availableBindings.Length; ++i)
             {
                 KeyCode keyCode = (KeyCode)availableBindings.GetValue(i);
+
+                if (keyCode == KeyCode.Mouse0)
+                {
+                    continue;
+                }
+
                 if (Input.GetKeyDown(keyCode))
                 {
                     Binding = keyCode;