New crash on discord.com

[Gingeh]

Bisected to 336684b (from #3276)
Non-minimal reproduction: https://discord.com/

Remind me to try minimising the crash tomorrow.

[teaalltr]

Bisected to 336684b (from #3276) Non-minimal reproduction: https://discord.com/ (or https://bitwarden.com/)

Remind me to try minimising the crash tomorrow.

Just a reminder to minimize the crash 😉

[Gingeh]

Thanks for the reminder, I totally forgot!

Here's the reduction:

<svg>inline text before <g style="display: block"></g></svg>

[Gingeh]

This crash is happening because svg boxes are inserted with m_ancestor_stack.last()->append_child(*layout_node) instead of insert_node_into_inline_or_block_ancestor(*layout_node, display, AppendOrPrepend::Append), this causes them to skip the calls to set_children_are_inline in the latter function.
The crash can be prevented by duplicating that logic for the svg box case but that's not ideal, @gmta what do you think?