Tweak editor status colors (success, warning, error)

Some of the previous colors were "overbright" in the sense that
some of their components were above 1, causing font anti-aliasing
to look bad.

These new colors should be easier on the eyes while fitting better
with the rest of the editor's color palette.

editor/editor_themes.cpp

@@ -351,18 +351,18 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 
 	theme->set_color("mono_color", "Editor", mono_color);
 
-	Color success_color = accent_color.linear_interpolate(Color(0.2, 1, 0.2), 0.6) * 1.2;
-	Color warning_color = accent_color.linear_interpolate(Color(1, 1, 0), 0.7) * 1.0;
-	Color error_color = accent_color.linear_interpolate(Color(1, 0, 0), 0.8) * 1.7;
+	Color success_color = Color(0.45, 0.95, 0.5);
+	Color warning_color = Color(1, 0.87, 0.4);
+	Color error_color = Color(1, 0.47, 0.42);
 	Color property_color = font_color.linear_interpolate(Color(0.5, 0.5, 0.5), 0.5);
 
 	if (!dark_theme) {
-		// yellow on white themes is a P.I.T.A.
-		warning_color = accent_color.linear_interpolate(Color(0.9, 0.7, 0), 0.9);
-		warning_color = warning_color.linear_interpolate(mono_color, 0.2);
-		success_color = success_color.linear_interpolate(mono_color, 0.2);
-		error_color = error_color.linear_interpolate(mono_color, 0.2);
+		// Darken some colors to be readable on a light background
+		success_color = success_color.linear_interpolate(mono_color, 0.35);
+		warning_color = warning_color.linear_interpolate(mono_color, 0.35);
+		error_color = error_color.linear_interpolate(mono_color, 0.25);
 	}
+
 	theme->set_color("success_color", "Editor", success_color);
 	theme->set_color("warning_color", "Editor", warning_color);
 	theme->set_color("error_color", "Editor", error_color);