`GraphNode` slots don't work if a non-`Control` node is added anywhere above the last child

[nagidev]

Tested versions

• Reproducible in v4.3.dev.custom_build [c7f56d3], v4.2.2.stable.official [15073afe3]

System information

Godot v4.3.dev (c7f56d3) - Pop!_OS 22.04 LTS - X11 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1650 (nvidia; 550.67) - Intel(R) Core(TM) i5-9300H CPU @ 2.40GHz (8 Threads)

Issue description

Adding any node that is not a Control node as a child of a GraphNode and keeping it at an index that's not last, makes the slots at that index stop working. Dragging from those slots does not show a connection line.

Additionally, setting any non-last control node's size flag to expand makes the very last slot to stop working as well. However, this may be caused due to the slot drawing outside the GraphNode as noted in issue #85558

Steps to reproduce

1. Create the following scene tree:

GraphEdit
└ GraphNode
  ├ Label
  ├ Timer
  └ Label2

2. Set both the slots of the GraphNode to enabled (doesn't matter left or right).
3. Run the scene and try to drag out both the slots.

Expected behaviour: both slot would show connection lines Current behaviour: second slot does not show connection line

Note: Adding more non-Control nodes above the control nodes makes more slots stop working.

Minimal reproduction project (MRP)

N/A