From f3557970a7dca4e089e1660c47947a8d22ae1aa5 Mon Sep 17 00:00:00 2001
From: Greg Johnston <greg.johnston@gmail.com>
Date: Sun, 29 Jun 2025 17:10:05 -0400
Subject: [PATCH] fix: uses `EXISTS` to mark things that don't exist in the DOM

---
 leptos/src/into_view.rs   | 1 +
 meta/src/lib.rs           | 1 +
 meta/src/title.rs         | 1 +
 tachys/src/view/tuples.rs | 4 ++--
 4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/leptos/src/into_view.rs b/leptos/src/into_view.rs
index 7ae54aeae..7206140d5 100644
--- a/leptos/src/into_view.rs
+++ b/leptos/src/into_view.rs
@@ -90,6 +90,7 @@ impl<T: RenderHtml> RenderHtml for View<T> {
     type Owned = View<T::Owned>;
 
     const MIN_LENGTH: usize = <T as RenderHtml>::MIN_LENGTH;
+    const EXISTS: bool = <T as RenderHtml>::EXISTS;
 
     async fn resolve(self) -> Self::AsyncOutput {
         self.inner.resolve().await
diff --git a/meta/src/lib.rs b/meta/src/lib.rs
index b4962ee3d..2b0e5fa03 100644
--- a/meta/src/lib.rs
+++ b/meta/src/lib.rs
@@ -413,6 +413,7 @@ where
     type Owned = RegisteredMetaTag<E, At::CloneableOwned, Ch::Owned>;
 
     const MIN_LENGTH: usize = 0;
+    const EXISTS: bool = false;
 
     fn dry_resolve(&mut self) {
         self.el.dry_resolve()
diff --git a/meta/src/title.rs b/meta/src/title.rs
index 305e58b9c..a81589a85 100644
--- a/meta/src/title.rs
+++ b/meta/src/title.rs
@@ -322,6 +322,7 @@ impl RenderHtml for TitleView {
     type Owned = Self;
 
     const MIN_LENGTH: usize = 0;
+    const EXISTS: bool = false;
 
     fn dry_resolve(&mut self) {}
 
diff --git a/tachys/src/view/tuples.rs b/tachys/src/view/tuples.rs
index 2513d086a..3b8535f67 100644
--- a/tachys/src/view/tuples.rs
+++ b/tachys/src/view/tuples.rs
@@ -134,6 +134,7 @@ where
     type Owned = (A::Owned,);
 
     const MIN_LENGTH: usize = A::MIN_LENGTH;
+    const EXISTS: bool = A::EXISTS;
 
     fn html_len(&self) -> usize {
         self.0.html_len()
@@ -239,7 +240,6 @@ macro_rules! impl_view_for_tuples {
 		{
 			type State = ($first::State, $($ty::State,)*);
 
-
 			fn build(self) -> Self::State {
                 #[allow(non_snake_case)]
                 let ($first, $($ty,)*) = self;
@@ -267,7 +267,7 @@ macro_rules! impl_view_for_tuples {
 		{
             type AsyncOutput = ($first::AsyncOutput, $($ty::AsyncOutput,)*);
             type Owned = ($first::Owned, $($ty::Owned,)*);
-
+            const EXISTS: bool = $first::EXISTS || $($ty::EXISTS || )* false;
             const MIN_LENGTH: usize = $first::MIN_LENGTH $(+ $ty::MIN_LENGTH)*;
 
             #[inline(always)]