Merge Tags when sending event

[xamix]

Description

When I capture an event, I add some specific tags in the event.
But when I capture the event, all the "globally settled tags" via sentry_set_tag are dropped

This is due to this line which replace the globals tags by the currently settled one:
https://github.com/getsentry/sentry-native/blob/master/src/sentry_scope.c#L281

As the comment in code suggest, should the tags be merged?
If it is the case then we cannot replace all tags anymore...
Maybe a function should be added to add "volatile" tags only on the current event?

In the mean time how can I retrieve the originals globals tags and add it to my new tags object?

When does the problem happen

Each time I capture an event with specific key tags settled

• During build
• [X ] During run-time
• When capturing a hard crash

Environment

WSL Linux Ubuntu 20.04 64bits

Steps To Reproduce

Call this line with new_tags containing others tags value and then capture event

sentry_value_set_by_key(event, "tags", new_tags);

[Swatinem]

This is indeed a missing feature, yes.

[kahest]

@supervacuus @Swatinem looks like this has been implemented with 047cf98#diff-84d598b3c4cc08e878cc83551a26a234018ddf3e72537e8b19ff62f5e83c8975 - can you confirm?

related PR: #650

[Swatinem]

Yes I believe it was