DRC ref. for extend edge

kmho

I'm looking for some DRC ref. for extend edge:
Now I just got the operating layer (m1_enc_cont). Can someone tell me how can I extend the red line for 0.02um as below image. Thanks.

cont = input(6) # black polygon
m1 = input(7) # red line

m1_enc_cont = m1.enclosing(cont,0.05) # Yellow is the violation
......
......

laurent_c

Then the way to code this error is described in :
https://www.klayout.de/forum/discussion/comment/5381

Laurent