Correct focus issue with TextEdit boxes

Common/UI/Root.cpp

@@ -156,6 +156,10 @@ static void MoveFocus(ViewGroup *root, FocusDirection direction) {
 		return;
 	}
 
+	if (!focusedView->CanMoveFocus(direction)) {
+		return;
+	}
+
 	NeighborResult neigh = root->FindNeighbor(focusedView, direction, NeighborResult());
 	if (neigh.view) {
 		neigh.view->SetFocus();

Common/UI/View.h

@@ -414,6 +414,7 @@ public:
 
 	virtual bool CanBeFocused() const { return true; }
 	virtual bool SubviewFocused(View *view) { return false; }
+	virtual bool CanMoveFocus(FocusDirection dir) const { return true; }
 
 	void SetPopupStyle(bool popupStyle) { popupStyle_ = popupStyle; }
 
@@ -1111,6 +1112,8 @@ public:
 	}
 
 	void FocusChanged(int focusFlags) override;
+
+	bool CanMoveFocus(FocusDirection dir) const { return dir != FocusDirection::FOCUS_LEFT && dir != FocusDirection::FOCUS_RIGHT; }
 	void GetContentDimensions(const UIContext &dc, float &w, float &h) const override;
 	void Draw(UIContext &dc) override;
 	std::string DescribeText() const override;