Fix CI: #[inline], clippy, and the imageviewer snapshot

* `Frame::invisible` needs `#[inline]` like every other builder method.
* `TextVisuals::new` took a `TextStyle` by value but only borrowed it. Take
  an `impl Into<FontSelection>` instead, which consumes it and lets a theme
  hand over a `FontId` directly.
* A hovered small button now paints its border a pixel further out, since
  its padding is zeroed before the expansion correction.

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

crates/egui/src/containers/frame.rs

@@ -332,6 +332,7 @@ impl Frame {
     /// Make this frame invisible by setting background and stroke to transparent.
     ///
     /// Will not affect layout or contents.
+    #[inline]
     pub fn invisible(mut self) -> Self {
         self.fill = Color32::TRANSPARENT;
         self.stroke.color = Color32::TRANSPARENT;

crates/egui/src/widget_style/mod.rs

@@ -17,7 +17,7 @@ use core::fmt::Debug;
 use epaint::{Color32, FontId, Stroke, Vec2};
 
 use crate::{
-    Context, Frame, Response, Style, TextStyle, UiStack,
+    Context, FontSelection, Frame, Response, Style, UiStack,
     style::{WidgetVisuals, Widgets},
 };
 
@@ -35,26 +35,26 @@ pub struct TextVisuals {
 }
 
 impl TextVisuals {
-    /// Text in `color`, using the font of the given [`TextStyle`].
+    /// Text in `color`, using the given font.
     ///
-    /// `style.override_font_id` wins over `text_style`, if it is set.
-    pub fn new(style: &Style, text_style: TextStyle, color: Color32) -> Self {
+    /// `style.override_font_id` wins over `font`, if it is set.
+    pub fn new(style: &Style, font: impl Into<FontSelection>, color: Color32) -> Self {
         Self {
             color,
             font_id: style
                 .override_font_id
                 .clone()
-                .unwrap_or_else(|| text_style.resolve(style)),
+                .unwrap_or_else(|| font.into().resolve(style)),
         }
     }
 
     /// The text of a widget, colored by the [`WidgetVisuals`] of its current state.
     pub fn from_widget_visuals(
         style: &Style,
-        text_style: TextStyle,
+        font: impl Into<FontSelection>,
         widget_visuals: &WidgetVisuals,
     ) -> Self {
-        Self::new(style, text_style, widget_visuals.text_color())
+        Self::new(style, font, widget_visuals.text_color())
     }
 }
 

crates/egui_demo_app/tests/snapshots/imageviewer.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:24fc466f6470761a5064a590929fa3a0d95741ed691fc257415eee349bc528e9
-size 101394
+oid sha256:6264f32d3323d0d499ba0da9d379e562c06a7f50930dbec424039549ce7f50f9
+size 101414