Source maps of core do not reflect lines positions in debugging

[wdoberschuetz]

Description Try to set a breakpoint when debugging i.e. routing.js of the core part of Luigi.

Expected result I'm able to set breakpoints in the code of the core and it reflects the position in the code.

Actual result I.e. I see a line in the code but I cannot set any breakpoint there. When I invoke the method, it seems that the breakpoints are set a few lines up or down the code. It seems that what I see isn't reflected in the sourcemap.

Steps to reproduce Go to some method in any of the core files, I went to routing.js and tried to set breakpoints in updateModalPathData.