try to avoid google play recommendation for calling setNavigationBarColor().

                getWindow().getDecorView().setSystemUiVisibility(flags & ~View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);

            }*/

            test_set_show_under_navigation = enable;

            // in theory the VANILLA_ICE_CREAM is redundant as we shouldn't be here on Android 15+ anyway (since edge_to_edge_mode==true), but

            // wrapping in case this helps Google Play recommendation to avoid deprecated APIs for edge-to-edge

            if( Build.VERSION.SDK_INT < Build.VERSION_CODES.VANILLA_ICE_CREAM ) {

                WindowCompat.setDecorFitsSystemWindows(getWindow(), !enable);

            }

        }

        // in theory the VANILLA_ICE_CREAM is redundant as we shouldn't be here on Android 15+ anyway (since edge_to_edge_mode==true), but

        // wrapping in case this helps Google Play recommendation to avoid deprecated APIs for edge-to-edge

        if( Build.VERSION.SDK_INT < Build.VERSION_CODES.VANILLA_ICE_CREAM ) {

            getWindow().setNavigationBarColor(enable ? Color.TRANSPARENT : Color.BLACK);

        }

    }

    public int getNavigationGap() {

        return (want_no_limits || edge_to_edge_mode) ? navigation_gap : 0;