unittest more of the color formats

* to ensure noticing if breaking changes happen
* document breaking change in changelog

CHANGELOG.md

@@ -7,8 +7,30 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Breaking Changes
+
+#### Theme file format
+
+**note:** this actually applied to the previous release already: `0.26.2`
+
+Ratatui (upstream terminal rendering crate) changed its serialization format for Colors. So the theme files have to be adjusted.
+
+`selection_fg: Some(White)` -> `selection_fg: Some("White")`
+
+but this also allows us now to define colors in the common hex format:
+
+`selection_fg: Some(Rgb(0,255,0))` -> `selection_fg: Some("#00ff00")`
+
+Checkout [THEME.md](./THEME.md) for more info.
+
+### Fixes
+* update yanked dependency to `libc` to fix building with `--locked`.
+* document breaking change in theme file format.
+
 ## [0.26.2] - 2024-04-17
 
+**note:** this release introduced a breaking change documented in the following release: `0.26.3`
+
 ### Fixes
 * fix `cargo install` without `--locked` ([#2098](https://github.com/extrawurst/gitui/issues/2098))
 * respect configuration for remote when fetching (also applies to pulling) [[@cruessler](https://github.com/cruessler)] ([#1093](https://github.com/extrawurst/gitui/issues/1093))

THEMES.md

@@ -18,8 +18,8 @@ Example theme override:
 
 ```
 (
-    selection_bg: Some(Blue),
+    selection_bg: Some("Blue"),
-    selection_fg: Some(White),
+    selection_fg: Some("#ffffff"),
 )
 ```
 

src/ui/style.rs

@@ -374,18 +374,21 @@ mod tests {
 
 		writeln!(
 			file,
-			r#"
+			r##"
 (
-	selection_bg: Some("White"),
+	selection_bg: Some("Black"),
+	selection_fg: Some("#ffffff"),
 )
-"#
+"##
 		)
 		.unwrap();
 
 		let theme = Theme::init(&file.path().to_path_buf());
 
-		assert_eq!(theme.selection_fg, Theme::default().selection_fg);
+		assert_eq!(theme.selected_tab, Theme::default().selected_tab);
-		assert_eq!(theme.selection_bg, Color::White);
+
 		assert_ne!(theme.selection_bg, Theme::default().selection_bg);
+		assert_eq!(theme.selection_bg, Color::Black);
+		assert_eq!(theme.selection_fg, Color::Rgb(255, 255, 255));
 	}
 }