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phosit f5b416c63b Don't execute the task when no Future awaits it anymore
Summary:
Most of the times the callback stores a reference to a variable in scope
where the `Future` is in. When the scope is left the reference get's
dangling. `CancelOrWait` is called in multiple places (mostly
destructors) to ensure the callback isn't executed anymore.
This patch deduplicates thous calls to `CancelOrWait`.

Refs: #5874

Comments by: @Stan, @vladislavbelov
Differential Revision: https://code.wildfiregames.com/D5208
This was SVN commit r28128.
2024-06-25 19:03:01 +00:00
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