Understanding Emoji / Unicode Rendering in Terminal

[MartinSGill]

I'm trying to understand what the current situation is with regards to Emoji/Unicode support in Terminal, in a simple straightforward manner for people (like me) without detailed knowledge of fonts/Unicode or how DirectDraw works.

I found many issues (most closed) discussing aspects of this, but I'm finding it really hard to read any concrete answers in them.

Perhaps a (very) short explanation of how Windows displays emoji might help me. I read somewhere that this is done by DirectDraw APIs. Does DirectDraw detect the Emoji sequence and instead of drawing the font "letter" it instead renders a "colour image" for that sequence?

With reference to the screenshot at the bottom, what I'd really like to know:

1. Is this something I can fix? (e.g. a setting, different font)
2. Is this something I should report? (and to whom)

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The tiny symbols. Is that an issue with the font, a setting I need to adjust in Windows, a setting I need to tweak in Terminal, or just nothing to be done?

Issue #900 talks about this, with @DHowett mentioning this:

[...] The default representation for ⚠ is "narrow, single-width, non-emoji". The bug here is that it is yellow (emoji presentation), not that it is small.

I notice that all my "tiny" symbols are marked as "unqualified" in Unicode. I have no idea what that really means, but
is there a way for me to change the "default representation" for all "unqualified" Unicode emojis so they are the same size as other emojis?

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The missing symbols. Is that a problem with my font not supporting the character, or with Windows not supporting that character (Unicode version?) Do I need to change my terminal font, or wait for an OS update?

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