gpui: Bump taffy from 0.10.1 to 0.12.1 (#60721)

Migrates the alignment conversions to taffy's new safe-alignment style
types: `AlignItems`/`AlignContent` and friends are now structs pairing a
keyword with a safety modifier, constructed via associated constants
(e.g. `AlignItems::START`) instead of enum variants.

The motivating change in this release is [taffy
#911](https://github.com/DioxusLabs/taffy/commit/df2663aad35801f7522f6878a0300646dfe624f7)
("More correct caching logic"), which keys taffy's per-node measure
cache on axis, parent size, and available space. Today GPUI is largely
immune to the old cache-key conflation because text answers every sizing
probe with the same width; the follow-up PR in this stack (honest
min-content text measurement) returns different sizes for different
constraints, which makes cache-key correctness a prerequisite. 0.12.1
additionally hotfixes two block layout/caching regressions in 0.12.0,
and 0.11.0's grid fix (resolving item percentages against the grid area
rather than the container) comes along as well.

Stack:
1. **This PR** — taffy 0.12.1
2. #60722 — honest min-content text measurement
3. #60723 — CSS `auto` grid tracks for table-like column sizing

Release Notes:

- N/A

Cargo.lock

@@ -18274,9 +18274,9 @@ dependencies = [
 
 [[package]]
 name = "taffy"
-version = "0.10.1"
+version = "0.12.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aea22054047c16c3f34d3ac473a2170be1424b1115b2a3adcf28cfb067c88859"
+checksum = "73afc801dd6bd47529eaa7c7e90557f107527d1b7c9c7ed7d7803c7b8d0c357f"
 dependencies = [
  "arrayvec",
  "grid",

crates/gpui/Cargo.toml

@@ -91,7 +91,7 @@ async-channel.workspace = true
 stacksafe.workspace = true
 strum.workspace = true
 sum_tree.workspace = true
-taffy = "=0.10.1"
+taffy = "=0.12.1"
 thiserror.workspace = true
 gpui_util.workspace = true
 hdrhistogram = { workspace = true, optional = true }

crates/gpui/src/style.rs

@@ -1245,13 +1245,13 @@ pub enum Position {
 impl From<AlignItems> for taffy::style::AlignItems {
     fn from(value: AlignItems) -> Self {
         match value {
-            AlignItems::Start => Self::Start,
-            AlignItems::End => Self::End,
-            AlignItems::FlexStart => Self::FlexStart,
-            AlignItems::FlexEnd => Self::FlexEnd,
-            AlignItems::Center => Self::Center,
-            AlignItems::Baseline => Self::Baseline,
-            AlignItems::Stretch => Self::Stretch,
+            AlignItems::Start => Self::START,
+            AlignItems::End => Self::END,
+            AlignItems::FlexStart => Self::FLEX_START,
+            AlignItems::FlexEnd => Self::FLEX_END,
+            AlignItems::Center => Self::CENTER,
+            AlignItems::Baseline => Self::BASELINE,
+            AlignItems::Stretch => Self::STRETCH,
         }
     }
 }
@@ -1259,15 +1259,15 @@ impl From<AlignItems> for taffy::style::AlignItems {
 impl From<AlignContent> for taffy::style::AlignContent {
     fn from(value: AlignContent) -> Self {
         match value {
-            AlignContent::Start => Self::Start,
-            AlignContent::End => Self::End,
-            AlignContent::FlexStart => Self::FlexStart,
-            AlignContent::FlexEnd => Self::FlexEnd,
-            AlignContent::Center => Self::Center,
-            AlignContent::Stretch => Self::Stretch,
-            AlignContent::SpaceBetween => Self::SpaceBetween,
-            AlignContent::SpaceEvenly => Self::SpaceEvenly,
-            AlignContent::SpaceAround => Self::SpaceAround,
+            AlignContent::Start => Self::START,
+            AlignContent::End => Self::END,
+            AlignContent::FlexStart => Self::FLEX_START,
+            AlignContent::FlexEnd => Self::FLEX_END,
+            AlignContent::Center => Self::CENTER,
+            AlignContent::Stretch => Self::STRETCH,
+            AlignContent::SpaceBetween => Self::SPACE_BETWEEN,
+            AlignContent::SpaceEvenly => Self::SPACE_EVENLY,
+            AlignContent::SpaceAround => Self::SPACE_AROUND,
         }
     }
 }