SYSTEM THEME? is a strange name for this predicate because you can't tell from the name whether True means light or dark! I suggest either DARK THEME? or SYSTEM THEME DARK?
I think you have the wrong picture to illustrate shift-right-click on a custom block. (Nothing is in red.)
. 2½. This isn't one of your new features, but the graphic codes (arrows) along with the "move to top" etc. options are confusing, to me, because they all have two verticals. Move to top/bottom have two copies of a plain up/downarrow; move up/down have a double arrow, so again, two verticals. I think it'd be better to use plain arrows instead of double arrows.
Good idea, I was thinking of this, but instead opted for a help menu
I didn't even think about that, will do.
Heres the story:
I tried using $upArrow and $downArrow, but that didn't work.
So, I found a Wikipedia page with Unicode symbols. I found a double up and down arrow, which I used for move to top and move to bottom. I found a regular one arrow version of those symbols, but for some reason, it renders as, well not nice
Yeah, browser writers are weird about how they render things. Maybe you can use one of the more obscure arrows, such as ⭡ (UPWARDS TRIANGLE-HEADED ARROW, U+2B61) or ￪ (HALFWIDTH UPWARDS ARROW, U+FFEA) supposing your browser renders them correctly (or at all).
Alternatively, maybe you could use the double arrow for "move up" and "move down" as you are now, but use ⟰ (UPWARDS QUADRUPLE ARROW, U+27F0) for "move to top/bottom." :~) Although I admit that the quadruple arrow looks more like the icon for "home page" than like an arrow!