Make weak_text_color an Option

CHANGELOG.md

@@ -8,6 +8,9 @@ NOTE: [`epaint`](crates/epaint/CHANGELOG.md), [`eframe`](crates/eframe/CHANGELOG
 * ⚠️ BREAKING: Fix text being too small ([#2069](https://github.com/emilk/egui/pull/2069)).
 * ⚠️ BREAKING: egui now expects integrations to do all color blending in gamma space ([#2071](https://github.com/emilk/egui/pull/2071)).
 
+### Added ⭐
+* Added `egui::Visuals::weak_text_color`.
+
 ### Fixed 🐛
 * Improved text rendering ([#2071](https://github.com/emilk/egui/pull/2071)).
 

crates/egui/src/style.rs

@@ -450,6 +450,11 @@ pub struct Visuals {
     /// Background color behind code-styled monospaced labels.
     pub code_bg_color: Color32,
 
+    /// Color used for weak text.
+    ///
+    /// If `None`, a color is automatially chosen based on [`Self::text_color`] and [`Self::window_fill`].
+    pub weak_text_color: Option<Color32>,
+
     /// A good color for warning text (e.g. orange).
     pub warn_fg_color: Color32,
 
@@ -489,7 +494,9 @@ impl Visuals {
     }
 
     pub fn weak_text_color(&self) -> Color32 {
-        crate::color::tint_color_towards(self.text_color(), self.window_fill())
+        self.weak_text_color.unwrap_or_else(|| {
+            crate::color::tint_color_towards(self.text_color(), self.window_fill())
+        })
     }
 
     #[inline(always)]
@@ -675,6 +682,7 @@ impl Visuals {
             faint_bg_color: Color32::from_gray(35),
             extreme_bg_color: Color32::from_gray(10), // e.g. TextEdit background
             code_bg_color: Color32::from_gray(64),
+            weak_text_color: None,
             warn_fg_color: Color32::from_rgb(255, 143, 0), // orange
             error_fg_color: Color32::from_rgb(255, 0, 0),  // red
             window_rounding: Rounding::same(6.0),
@@ -1181,6 +1189,7 @@ impl Visuals {
             faint_bg_color,
             extreme_bg_color,
             code_bg_color,
+            weak_text_color: _, // TODO(emilk)
             warn_fg_color,
             error_fg_color,
             window_rounding,