Tweak the editor splash screen color to better match the default theme

This helps achieve a visually "smoother" transition between the splash
screen and the editor.

(cherry picked from commit ff2871f9ac73e9f11af25bdce71400bb4a1d24ae)

main/main.cpp

@@ -1354,7 +1354,13 @@ Error Main::setup2(Thread::ID p_main_tid_override) {
 				ERR_PRINTS("Non-existing or invalid boot splash at '" + boot_logo_path + "'. Loading default splash.");
 		}
 
-		Color boot_bg_color = GLOBAL_DEF("application/boot_splash/bg_color", boot_splash_bg_color);
+#if defined(TOOLS_ENABLED) && !defined(NO_EDITOR_SPLASH)
+		const Color boot_bg_color =
+				GLOBAL_DEF("application/boot_splash/bg_color",
+						(editor || project_manager) ? boot_splash_editor_bg_color : boot_splash_bg_color);
+#else
+		const Color boot_bg_color = GLOBAL_DEF("application/boot_splash/bg_color", boot_splash_bg_color);
+#endif
 		if (boot_logo.is_valid()) {
 			OS::get_singleton()->_msec_splash = OS::get_singleton()->get_ticks_msec();
 			VisualServer::get_singleton()->set_boot_image(boot_logo, boot_bg_color, boot_logo_scale, boot_logo_filter);

main/main_builders.py

@@ -19,6 +19,7 @@ def make_splash(target, source, env):
         g.write("/* THIS FILE IS GENERATED DO NOT EDIT */\n")
         g.write("#ifndef BOOT_SPLASH_H\n")
         g.write("#define BOOT_SPLASH_H\n")
+        # Use a neutral gray color to better fit various kinds of projects.
         g.write("static const Color boot_splash_bg_color = Color(0.14, 0.14, 0.14);\n")
         g.write("static const unsigned char boot_splash_png[] = {\n")
         for i in range(len(buf)):
@@ -38,7 +39,9 @@ def make_splash_editor(target, source, env):
         g.write("/* THIS FILE IS GENERATED DO NOT EDIT */\n")
         g.write("#ifndef BOOT_SPLASH_EDITOR_H\n")
         g.write("#define BOOT_SPLASH_EDITOR_H\n")
-        g.write("static const Color boot_splash_editor_bg_color = Color(0.14, 0.14, 0.14);\n")
+        # The editor splash background color is taken from the default editor theme's background color.
+        # This helps achieve a visually "smoother" transition between the splash screen and the editor.
+        g.write("static const Color boot_splash_editor_bg_color = Color(0.125, 0.145, 0.192);\n")
         g.write("static const unsigned char boot_splash_editor_png[] = {\n")
         for i in range(len(buf)):
             g.write(byte_to_str(buf[i]) + ",\n")