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=====Connection Lookup=====

The connection lookup algorithm starts at an object and looks for any objects that touch the starting object or any object touching the starting object. This code is implemented in find.c and used throughout the code base for a variety of purposes.

====Uses of the Connection Lookup Algorithm====

=== DRC ===
The DRC uses the connection lookup code in combination with the "Bloat" and "Shrink" settings to detect places with insufficient spacing and overlap. 

=== NotifyLine ===
action.c

=== NotifyMode ===
action.c

=== ActionConnection ===
action.c

=== Places that call DoIt ===
==Notes from 20180810==
Saves list of unused pins and pads:
ActionSaveTo:action.c:5752
LookupUnusedPins:find.c:2464
PrintAndSelectUnusedPinsAndPadsOfElement:find.c:1982
DoIt:find.c:2000, 2044

Saves list of element connections
ActionSaveTo:action.c:5752
LookupElementConnections:find.c:2255
PrintElementConnections:find.c:2120
DoIt:find.c:2136, 2161

There are quite a few of these.
(action.c: 905, 906, 1366, 2314, 2315, 2789, 2792) LookupConnection:find.c:2376
(netlist.c: 171, 180) LookupConnection:find.c:2376
(report.c: 598) LookupConnection:find.c:2376
DoIt:find.c:2417

(ipcd356.c: 493, 514, 538) LookupConnectionByPin:find.c:2431
DoIt:find.c:2439

(gsvit.c:433) RatFindHook:find.c:2450
(lesstif/netlist.c:140) RatFindHook:find.c:2450
(gtk/gui-netlist-window.c:543) RatFindHook:find.c:2450
(rats.c:474) RatFindHook:find.c:2450
(select.c:996) RatFindHook:find.c:2450
DoIt:find.c:2456

start_do_it_and_dump:find.c:2681
DoIt:find.c:2689

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