Use ClassName for DragValue::CLASS

`has_class` now takes `&str`, so class definitions stay `ClassName` for
consistency with the built-in `Button` and `TextEdit` classes.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

crates/egui/src/theme/default_style.rs

@@ -147,12 +147,11 @@ impl StyleProvider<TextEditStyle> for DefaultStyle {
             atom_layout: AtomLayoutStyle {
                 frame: Frame {
                     fill,
-                    stroke,
                     corner_radius: widget_visuals.corner_radius,
                     inner_margin: Margin::symmetric(4, 2),
                     ..Default::default()
                 }
-                .expand_in_place(widget_visuals.expansion),
+                .apply_stroke_and_expansion_without_layout_shift(stroke, widget_visuals.expansion),
                 gap: style.spacing.icon_spacing,
                 text_style: text,
                 ..Default::default()

crates/egui/src/widgets/drag_value.rs

@@ -1,8 +1,9 @@
 use crate::{
     Atom, AtomExt as _, AtomKind, Atoms, Button, CursorIcon, Id, IntoAtoms, Key, MINUS_CHAR_STR,
     Modifiers, NumExt as _, Response, RichText, Sense, TextEdit, TextWrapMode, Ui, Widget,
-    WidgetInfo, emath, text,
-    widget_style::{Classes, HasClasses},
+    WidgetInfo,
+    class::{ClassName, Classes, HasClasses},
+    emath, text,
 };
 use core::{cmp::Ordering, ops::RangeInclusive};
 use emath::Vec2;
@@ -72,7 +73,7 @@ impl<'a> DragValue<'a> {
     const ATOM_ID: &'static str = "drag_item";
 
     /// Present on the [`Button`] and the [`TextEdit`] a drag value is built from.
-    pub const CLASS: &'static str = "egui::drag_value";
+    pub const CLASS: ClassName = ClassName::from_static("egui::drag_value");
 
     pub fn new<Num: emath::Numeric>(value: &'a mut Num) -> Self {
         let slf = Self::from_get_set(move |v: Option<f64>| {

crates/egui/src/widgets/text_edit/builder.rs

@@ -8,6 +8,7 @@ use crate::{
     CursorIcon, Event, EventFilter, FontSelection, Frame, IMEPurpose, Id, IdSalt, ImeEvent,
     IntoAtoms, IntoSizedResult, Key, KeyboardShortcut, Margin, Modifiers, NumExt as _, Response,
     Sense, SizedAtomKind, TextBuffer, TextStyle, Ui, Vec2, Widget, WidgetInfo, WidgetWithState,
+    class::{ClassName, Classes, HasClasses},
     epaint,
     os::OperatingSystem,
     output::OutputEvent,
@@ -17,7 +18,7 @@ use crate::{
         self, CCursorRange, text_cursor_state::cursor_rect, visuals::paint_text_selection,
     },
     vec2,
-    widget_style::{ClassName, Classes, HasClasses, TextEditStyle},
+    widget_style::TextEditStyle,
 };
 
 use super::{TextEditOutput, TextEditState};

tests/egui_tests/tests/snapshots/visuals/drag_value.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:f916e217bd4beb3637acb5394a7da876f9ec684860c9ca922f8bfa3ded6a2684
-size 9462
+oid sha256:73c293f63b9b7f02fd0f3a506dd076eb1e653b7fbb7554603e457b9ad2552f48
+size 9276