fix: keep explorer selections readable on light terminals

src/tui.rs

@@ -484,9 +484,22 @@ impl BufferViewports {
         }
         self.theme = theme;
         let colors = DiffColors::new(theme);
+        let file_selection_background = theme.and_then(|theme| {
+            let [r, g, b] = theme.background.map(u32::from);
+            if r * 299 + g * 587 + b * 114 < 128_000 {
+                return None;
+            }
+            // Keep ANSI status/directory foregrounds readable on light terminals.
+            let [r, g, b] = theme
+                .background
+                .map(|c| ((u16::from(c) * 95 + 50) / 100) as u8);
+            Some(Color::Rgb(r, g, b))
+        });
         self.panels.diff_colors = colors;
+        self.panels.file_selection_background = file_selection_background;
         for pane in self.parked.values_mut() {
             pane.panels.diff_colors = colors;
+            pane.panels.file_selection_background = file_selection_background;
         }
     }
 
@@ -542,6 +555,7 @@ impl BufferViewports {
             })()
             .unwrap_or_default();
             inherited.panels.diff_colors = self.panels.diff_colors;
+            inherited.panels.file_selection_background = self.panels.file_selection_background;
             self.parked.insert(id, inherited);
         }
         let outgoing = self
@@ -5699,6 +5713,7 @@ struct WheelPanels {
     picker_scroll: PickerScroll,
     diff: Option<DiffGeometry>,
     diff_colors: DiffColors,
+    file_selection_background: Option<Color>,
     diff_syntax: Option<DiffSyntaxCache>,
     previous_diff: Option<DiffGeometry>,
     diff_wrap: Option<DiffWrapViewport>,
@@ -6380,11 +6395,13 @@ fn draw_file_list(
                 };
                 if selected {
                     style = style
-                        .bg(if picker.focused {
-                            Color::Blue
-                        } else {
-                            Color::DarkGray
-                        })
+                        .bg(panels
+                            .file_selection_background
+                            .unwrap_or(if picker.focused {
+                                Color::Blue
+                            } else {
+                                Color::DarkGray
+                            }))
                         .add_modifier(Modifier::BOLD);
                 }
                 let changed = entry