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eeschema: overlapping symbols are sometimes not plotted correctly

Description

Overlapping symbols that are displayed correctly in eeschema are not always plotted to PDF correctly. The drawing order is wrong, depending on when things are modified.

Steps to reproduce

  1. Create an instance of Device:Opamp_Dual. Overlap unit C with unit A, the way it is designed to be used. image
  2. Plot the schematic to PDF.
  3. Observe the output. V- and V+ are probably visible on top of the symbol. image
  4. Go back to the schematic. If V-/V+ were visible, grab unit A and move it to the right. Then move it back to its original place. Save, and plot the schematic again. (If V-/V+ weren't visible in the pdf, do the same thing but with unit C).
  5. Observe the output. Visibility of V- and V+ have changed. image

In the case of creative usages of symbol overlap, this issue can change the meaning of the circuit to people reviewing it!

KiCad Version

Application: KiCad Schematic Editor

Version: 6.0.6-3a73a75311~116~ubuntu22.04.1, release build

Libraries:
	wxWidgets 3.0.5

Platform: Linux 5.15.0-37-generic x86_64, 64 bit, Little endian, wxGTK, xubuntu, x11

	wxWidgets: 3.0.5 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
	Boost: 1.74.0
	OCC: 7.5.2
	Curl: 7.83.1
	ngspice: 36
	Compiler: GCC 11.2.0 with C++ ABI 1016

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON