Remove box shadow override so that HideSplitViewButton focus ring is visible

Author: microbit-grace

src/common/SplitView/HideSplitViewButton.tsx

@@ -84,7 +84,6 @@ const HideSplitViewButton = React.forwardRef(
             _active: { background: "gray.200" },
             color: "brand.500",
             zIndex: "splitViewHideButton",
-            boxShadow: direction === "expandLeft" ? "md" : "none",
             ...cssProp,
           }}
           {...props}

src/editor/EditorArea.tsx

@@ -79,7 +79,7 @@ const EditorArea = React.forwardRef(
                 splitViewShown={simulatorShown}
                 direction="expandLeft"
                 text={intl.formatMessage({ id: "simulator-title" })}
-                css={{ ml: "5", boxShadow: "none" }}
+                css={{ ml: "5" }}
                 ref={simulatorButtonRef}
               />
             )}