Unintuitive Backannotation Dialog (was: Geographic Reannotation Changes Don't Propagate to Schematic)

Description

Edit (Qbort): The backannotation dialog is confusing to users - it is unclear to the user what the "re-link by reference designator" does.

Original report below:

Performing a "Geographical Reannotation" and then following up with "Update Schematic from PCB" does not propagate Reference Designator changes to the schematic. Instead, a duplicate copy of the affected footprints under their old Reference Designators appears on the PCB layout.

Steps to reproduce

1. Choose "Geographical Reannotate..." under the Tools menu in PCBNew.
2. Click "Reannotate PCB" with "All" selected.

• Log Entries are shown for all the Reference Designator Changes.
• Log entry: "PCB successfully reannotated".
• Log entry: "Warning: PCB annotation changes should be synchronized with schematic using the "Update Schematic from PCB" tool."

3. Choose "Update Schematic from PCB" under the Tools menus in Eeschema.

• 6 errors are shown ie. "Error: Cannot find symbol for footprint 'C10'."
• 13 warnings are shown ie. "Warning: Footprint 'U62' is not present on PCB. Corresponding symbols in schematic must be manually deleted (if desired)."

4. Click "Update Schematic" in Eeschema.

• A duplicate copy of our 16 footprints appear in PCBNew with their original Reference Designators off to the side of the layout.
• If "Update PCB from Schematic" is run with "Delete footprints with no symbols" checked, the renumbered footprints are deleted from the existing PCB layout.

KiCad Version

Application: KiCad (64-bit)

Version: (6.0.4), release build

Libraries:
	wxWidgets 3.1.5
	libcurl/7.78.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 19044), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Mar 18 2022 03:04:44
	wxWidgets: 3.1.5 (wchar_t,wx containers)
	Boost: 1.76.0
	OCC: 7.6.0
	Curl: 7.78.0-DEV
	ngspice: 36
	Compiler: Visual C++ 1928 without C++ ABI

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON
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