Re-render the main view without re-focusing the panel beneath it

Toggling whitespace needs the panel beneath to render its diff again, which
is what HandleRenderToMain is for; HandleFocus does that and also everything
else that belongs to a panel gaining the focus, which this panel already has
or, when the focus is in the main view, does not want. Re-selecting its
current item is harmless, but re-deriving its highlight as a focused panel's
is not: the selection turns bright while the user is somewhere else.

Changing the context size and switching diff renderers already ask for a
re-render this way.

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

pkg/gui/controllers/toggle_whitespace_action.go

@@ -27,6 +27,6 @@ func (self *ToggleWhitespaceAction) Call() error {
 
 	self.c.UserConfig().Git.IgnoreWhitespaceInDiffView = !self.c.UserConfig().Git.IgnoreWhitespaceInDiffView
 
-	self.c.Context().CurrentSide().HandleFocus(types.OnFocusOpts{})
+	self.c.Context().CurrentSide().HandleRenderToMain()
 	return nil
 }

pkg/integration/tests/ui/toggle_whitespace_keeps_unfocused_selection_dimmed.go

@@ -26,9 +26,6 @@ var ToggleWhitespaceKeepsUnfocusedSelectionDimmed = NewIntegrationTest(NewIntegr
 			Press(keys.Universal.ToggleWhitespaceInDiffView)
 
 		t.Views().Files().
-			/* EXPECTED:
 			SelectionIsInactive()
-			ACTUAL: */
-			SelectionIsActive()
 	},
 })