lots more refactoring

pkg/gui/context/patch_explorer_context.go

@@ -24,8 +24,6 @@ func NewPatchExplorerContext(
 	windowName string,
 	key types.ContextKey,
 
-	onFocus func(types.OnFocusOpts) error,
-	onFocusLost func(opts types.OnFocusLostOpts) error,
 	getIncludedLineIndices func() []int,
 
 	c *types.HelperCommon,
@@ -43,10 +41,7 @@ func NewPatchExplorerContext(
 			Kind:             types.MAIN_CONTEXT,
 			Focusable:        true,
 			HighlightOnFocus: true,
-		}), ContextCallbackOpts{
-			OnFocus:     onFocus,
-			OnFocusLost: onFocusLost,
-		}),
+		}), ContextCallbackOpts{}),
 	}
 }