Various message component bug fixes

[jr1221]

Description

Fixes issue where the structure of a modal is created incorrectly. A draft PR as modal improvements seem to still be needed.

Edit: second commit fixes modal interaction.

Connected issues & other potential problems

Modals still cannot be recieved, as multiple exceptions are triggered.

Edit: above fixed.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• Ran dart analyze or make analyze and fixed all issues
• Ran dart format --set-exit-if-changed -l 160 ./lib or make format and fixed all issues
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[jr1221]

I am just collecting various hacky fixes here. I do not intended to actually ask for this to be merged unless @abitofevrything wants me to, because I am sure he has better solutions to these problems.

[jr1221]

Alright I think this is ready to go.

[jr1221]

Sorry if I messed up the review process very new to public repositories.

[abitofevrything]

Looking good, just one small change for some future proofing.

Sorry if I messed up the review process very new to public repositories.

No worries, everything's fine! I just asked to review this last night, which is why it didn't get merged right after l7ssha'a approval.