EventContext: make constructor explicit

We do not want to implicitly convert an integer to an EventContext as this would almost certainly result in an invalid event context.

We just had a case in ATLAS where something like the following code compiled fine and only at runtime we got an invalid EventContext error:

void foo(const EventContext& ctx);

int context; // variable incidentally named context that has nothing to do with an `EventContext`
foo(context);

Thanks to @bstanisl for pointing this out. cc @smh

assigned to @clemenci

added lhcb-gaudi-head label

changed milestone to %v36r13

approved this merge request

• [2023-04-21 00:06] Validation started with lhcb-gaudi-head#3538
• [2023-04-21 00:14] Validation started with lhcb-run2-gaudi-head#499
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• [2023-04-23 00:12] Validation started with lhcb-run2-gaudi-head#500
• [2023-04-24 00:05] Validation started with lhcb-gaudi-head#3541
• [2023-04-24 00:15] Validation started with lhcb-run2-gaudi-head#501
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• [2023-04-25 00:26] Validation started with lhcb-run2-gaudi-head#502
• [2023-04-26 00:04] Validation started with lhcb-gaudi-head#3543
• [2023-04-26 00:16] Validation started with lhcb-run2-gaudi-head#503
• [2023-04-27 00:05] Validation started with lhcb-gaudi-head#3544
• [2023-04-27 00:25] Validation started with lhcb-run2-gaudi-head#504
• [2023-04-28 00:05] Validation started with lhcb-gaudi-head#3545
• [2023-04-28 00:21] Validation started with lhcb-run2-gaudi-head#505
• [2023-04-29 01:26] Validation started with lhcb-gaudi-head#3546
• [2023-04-29 01:36] Validation started with lhcb-run2-gaudi-head#506
• [2023-04-30 00:04] Validation started with lhcb-gaudi-head#3547
• [2023-04-30 00:12] Validation started with lhcb-run2-gaudi-head#507
• [2023-05-01 00:04] Validation started with lhcb-gaudi-head#3548
• [2023-05-02 00:04] Validation started with lhcb-gaudi-head#3549
• [2023-05-02 00:11] Validation started with lhcb-run2-gaudi-head#508
• [2023-05-03 00:04] Validation started with lhcb-gaudi-head#3550
• [2023-05-03 00:13] Validation started with lhcb-run2-gaudi-head#509
• [2023-05-04 00:04] Validation started with lhcb-gaudi-head#3551
• [2023-05-04 00:18] Validation started with lhcb-run2-gaudi-head#510
• [2023-05-04 10:17] Validation started with lhcb-gaudi-head#3552
• [2023-05-05 00:04] Validation started with lhcb-gaudi-head#3553
• [2023-05-05 00:26] Validation started with lhcb-run2-gaudi-head#511

mentioned in merge request atlas/athena!62527 (merged)

removed lhcb-gaudi-head label

resolved all threads

mentioned in merge request lhcb/Online!827 (merged)

added lhcb-gaudi-head label

mentioned in merge request atlas/athena!62510 (merged)

merged

mentioned in commit 91812cb6