Fix logical ordering of floats and footnotes (#5185)

Author: laurmaedje

crates/typst/src/foundations/selector.rs

@@ -10,7 +10,7 @@ use crate::foundations::{
     cast, func, repr, scope, ty, CastInfo, Content, Context, Dict, Element, FromValue,
     Func, Label, Reflect, Regex, Repr, Str, StyleChain, Type, Value,
 };
-use crate::introspection::{Introspector, Locatable, Location};
+use crate::introspection::{Introspector, Locatable, Location, Unqueriable};
 use crate::symbols::Symbol;
 
 /// A helper macro to create a field selector used in [`Selector::Elem`]
@@ -339,7 +339,7 @@ impl FromValue for LocatableSelector {
         fn validate(selector: &Selector) -> StrResult<()> {
             match selector {
                 Selector::Elem(elem, _) => {
-                    if !elem.can::<dyn Locatable>() {
+                    if !elem.can::<dyn Locatable>() || elem.can::<dyn Unqueriable>() {
                         Err(eco_format!("{} is not locatable", elem.name()))?
                     }
                 }

crates/typst/src/introspection/counter.rs

@@ -12,7 +12,7 @@ use crate::foundations::{
     Element, Func, IntoValue, Label, LocatableSelector, NativeElement, Packed, Repr,
     Selector, Show, Smart, Str, StyleChain, Value,
 };
-use crate::introspection::{Introspector, Locatable, Location};
+use crate::introspection::{Introspector, Locatable, Location, Tag};
 use crate::layout::{Frame, FrameItem, PageElem};
 use crate::math::EquationElem;
 use crate::model::{FigureElem, FootnoteElem, HeadingElem, Numbering, NumberingPattern};
@@ -821,8 +821,8 @@ impl ManualPageCounter {
         for (_, item) in page.items() {
             match item {
                 FrameItem::Group(group) => self.visit(engine, &group.frame)?,
-                FrameItem::Tag(tag) => {
-                    let Some(elem) = tag.elem().to_packed::<CounterUpdateElem>() else {
+                FrameItem::Tag(Tag::Start(elem)) => {
+                    let Some(elem) = elem.to_packed::<CounterUpdateElem>() else {
                         continue;
                     };
                     if *elem.key() == CounterKey::Page {