Zoom In behavior to Object via Chat After Region Change

[calebrosia]

Steps to Reproduce:
User A and User B are in the same region
User A rezzes a prim and enters script

default
{
touch_start(integer total_number)
{
llSay(0, "Touch: llSay");
llWhisper(0, "Touch: llWhisper");
llShout(0, "Touch: llShout");
}
}

User A touches prim to emit and Object chat event
User B is able to Zoom In via Object chat event (right-click, Zoom In)
User B teleports away to a region that is not bordering the original region
User B right-clicks on the Object chat event

Actual Result
Object chat is still allowing User B to "Zoom In"
During this stale window, clicking "Zoom In" attempts to zoom the camera, but since you are not connected, the camera only moves within the region in the general direction of the object
Impact: This can confuse users, as the UI suggests the feature is available when it is not.

Expected Result
Consider immediately invalidating or disabling the "Zoom In" option when the region connection is dropped or the agent moves away, rather than waiting for a timeout.

Reference: #4474

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[Dan-Linden]

Passed QA.
Verified on Second Life Release 7.2.3.19118091373 on Win10/OSX in the scope of https://github.com/secondlife/iqa/issues/566

Teleporting about 1.5 regions away will invalidate the zoom in link. If you make the object visible again, then the zoom in link becomes active.