prevent panel from overflowing editor

Author: tsck

packages/code-editor/src/CodeEditor/hooks/extensions/useThemeExtension.ts

@@ -76,6 +76,7 @@ export function useThemeExtension({
             borderBottomRightRadius: `${borderRadius[300]}px`,
             borderTopLeftRadius: hasPanel ? 0 : `${borderRadius[300]}px`,
             borderTopRightRadius: hasPanel ? 0 : `${borderRadius[300]}px`,
+            overflow: 'hidden',
             color: color[theme].text[Variant.Primary][InteractionState.Default],
           },