#191 Crash if re-generating references

[Phil_W]

TinyCAD v 2.80.08 #631
W7 64 pro

Design has multiple instances of duplicated reference designators.
These need to be resolved.

Edit/Find.. (type in a duplicated refdes)
Select one in the list (eg C12) (do not close 'Design Markers' pop-up)
Select it on the sheet and edit its refdes to C? (Unallocated)
Go back to 'Design Markers' pop-up and click 'Generate Symbol References'
TinyCAD stops working.

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Problem signature:
Problem Event Name: APPCRASH
Application Name: TinyCad.exe
Application Version: 2.80.8.0
Application Timestamp: 557e0d71
Fault Module Name: TinyCad.exe
Fault Module Version: 2.80.8.0
Fault Module Timestamp: 557e0d71
Exception Code: c0000005
Exception Offset: 000a2e70
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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I can work around this but it probably shouldn't happen.
Hope that's useful.

Phil