lldb-dap: Stop using replicated variable ids (#124232)
Closes #119784
Probably closes #147105 as well, but I couldn't test due to #156473:
This PR fixes two bugs:
1. It generates unique variable reference IDs per suspended debuggee
state.
2. It stores all created variables in a stopped state instead of
dropping variables in unselected scopes. So it can properly handle all
scope/variable requests
It does this by storing all variables in their respective scopes and
using that mapping in request handlers that relied on the old mapping.
It dynamically creates new variable/scope IDs instead of resetting IDs
whenever a new scope is created.
I also removed some unused code as well.
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Co-authored-by: Med Ismail Bennani <ismail@bennani.ma>
Co-authored-by: Jonas Devlieghere <jonas@devlieghere.com>
Co-authored-by: Ebuka Ezike <yerimyah1@gmail.com>
(cherry picked from commit 6ca8f79fc88971412e6e5692ea86d680cd438fe3)
