[Profiler] Grouped deprecations from different packages hide useful info

[mhujer]

Symfony version(s) affected: 4.2.0

Description

When there are deprecations with same message, they are all grouped into one even if they are caused by different packages.

I've already fixed two packages (sensiolabs/SensioFrameworkExtraBundle#594 mhujer/JavaScriptErrorHandlerBundle#7), but I would prefer to see all the deprecations at once instead of getting only one. The screenshot shows the third package that appeared only after I fixed the first and then the second.

Possible Solution
Make the text (5 times) clickable and it would unfold all deprecations that are grouped into this row.

[nicolas-grekas]

Hello, the reason why it's grouped is performance: if we collect individual items per deprecation, the memory will explode and performance in dev mode will be horrible. I know because we made it this way to fix such issues.

[mhujer]

@nicolas-grekas That makes sense, thanks for the explanation!