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Created attachment 25375 [details]
An internal customer reported this and I was able to create an synthetic sample that shows the problem (attached).
Steps to reproduce:
- Open attached sln
- Add breakpoints to both TheValue properties (one in each lib project)
- Note only one is hit, the other has an empty sad circle because the pdb does not match the dll.
Reverted with https://github.com/xamarin/xamarin-macios/pull/3188 but only in 15.6
It _might_ be (one of) the reason(s) why debugging sometime fails but we cannot reproduce the issues. If that's the case then quite a few people could end up with a (not so helpful) build error.
We need a better alternative for 15.7 (it's not reverted in master). Something like a _useful_ warning instead of a _generic_ error.
Maybe it can be done on top of the existing PR ? or maybe another approach is needed.
Fixing this, differently, needs to work along
I'll double check the attached test case still works once I fix the issue.
without the fix (e.g. in 15.6) I hit only one breakpoint (bad)
with master/15.7 (original fix) I hit two breakpoints (good, but reverted for other issues)
with PR3203  I hit two breakpoints (good and does not break existing projects)
Merged in master with https://github.com/xamarin/xamarin-macios/commit/3a851e2a639206bfef7fa9b22a69e8fd4c5d227c