Code for debugging issue with no width available

This commit enables extremely verbose taffy logging and adds output of the layout ids for the Open Router settings container ID and the ID for the text input that has the issue.  https://gist.github.com/mgsloan/28a2d8d9c9c803fc60898eae9db1ec8e is the subsets of the logs starting with the first line with the container ID and ending with the last line that has the container ID (see the end of the logs for these IDs)

Repro for the issue:

* Set ui_font_size to 20 in user settings.json
* Open zed agent settings
* Expand Open Router settings
* Resize panel until the API key input field becomes small

crates/gpui/Cargo.toml

@@ -121,7 +121,7 @@ smallvec.workspace = true
 smol.workspace = true
 strum.workspace = true
 sum_tree.workspace = true
-taffy = "=0.9.0"
+taffy = { version = "=0.9.0", features = ["debug"] }
 thiserror.workspace = true
 util.workspace = true
 uuid.workspace = true

crates/gpui/src/elements/div.rs

@@ -23,6 +23,7 @@ use crate::{
     MouseClickEvent, MouseDownEvent, MouseMoveEvent, MouseUpEvent, Overflow, ParentElement, Pixels,
     Point, Render, ScrollWheelEvent, SharedString, Size, Style, StyleRefinement, Styled, Task,
     TooltipId, Visibility, Window, WindowControlArea, point, px, size,
+    taffy::{CONTAINER_LAYOUT_ID_TO_DEBUG, LAYOUT_ID_TO_DEBUG},
 };
 use collections::HashMap;
 use refineable::Refineable;
@@ -1298,7 +1299,23 @@ impl Element for Div {
                             .iter_mut()
                             .map(|child| child.request_layout(window, cx))
                             .collect::<SmallVec<_>>();
-                        window.request_layout(style, child_layout_ids.iter().copied(), cx)
+                        let layout_id =
+                            window.request_layout(style, child_layout_ids.iter().copied(), cx);
+                        if let Some(global_id) = global_id.as_ref()
+                            && global_id.0.ends_with(&["api-key-editor".into()])
+                        {
+                            LAYOUT_ID_TO_DEBUG.with_borrow_mut(|layout_id_to_debug| {
+                                *layout_id_to_debug = Some(layout_id)
+                            });
+                        }
+                        if let Some(global_id) = global_id.as_ref()
+                            && global_id.0.ends_with(&["open-router-container".into()])
+                        {
+                            CONTAINER_LAYOUT_ID_TO_DEBUG.with_borrow_mut(|layout_id_to_debug| {
+                                *layout_id_to_debug = Some(layout_id)
+                            });
+                        }
+                        layout_id
                     })
                 },
             )

crates/gpui/src/taffy.rs

@@ -3,7 +3,7 @@ use crate::{
 };
 use collections::{FxHashMap, FxHashSet};
 use smallvec::SmallVec;
-use std::{fmt::Debug, ops::Range};
+use std::{cell::RefCell, fmt::Debug, ops::Range};
 use taffy::{
     TaffyTree, TraversePartialTree as _,
     geometry::{Point as TaffyPoint, Rect as TaffyRect, Size as TaffySize},
@@ -11,6 +11,14 @@ use taffy::{
     tree::NodeId,
 };
 
+thread_local! {
+    pub static LAYOUT_ID_TO_DEBUG: RefCell<Option<LayoutId>> = const { RefCell::new(None) };
+}
+
+thread_local! {
+    pub static CONTAINER_LAYOUT_ID_TO_DEBUG: RefCell<Option<LayoutId>> = const { RefCell::new(None) };
+}
+
 type NodeMeasureFn = Box<
     dyn FnMut(Size<Option<Pixels>>, Size<AvailableSpace>, &mut Window, &mut App) -> Size<Pixels>,
 >;
@@ -198,6 +206,14 @@ impl TaffyLayoutEngine {
             )
             .expect(EXPECT_MESSAGE);
 
+        LAYOUT_ID_TO_DEBUG.with_borrow(|layout_id_to_debug| {
+            println!("Layout ID Debug: {:?}", layout_id_to_debug);
+        });
+
+        CONTAINER_LAYOUT_ID_TO_DEBUG.with_borrow(|layout_id| {
+            println!("Container Layout ID Debug: {:?}\n", layout_id);
+        });
+
         // println!("compute_layout took {:?}", started_at.elapsed());
     }
 

crates/language_models/src/provider/open_router.rs

@@ -853,6 +853,7 @@ impl Render for ConfigurationView {
             div().child(Label::new("Loading credentials...")).into_any()
         } else if self.should_render_editor(cx) {
             v_flex()
+                .id("open-router-container")
                 .size_full()
                 .on_action(cx.listener(Self::save_api_key))
                 .child(Label::new("To use Zed's agent with OpenRouter, you need to add an API key. Follow these steps:"))
@@ -872,6 +873,7 @@ impl Render for ConfigurationView {
                 )
                 .child(
                     h_flex()
+                        .id("api-key-editor")
                         .w_full()
                         .my_2()
                         .px_2()