[3.x] Add deselect() to RichTextLabel

scene/gui/rich_text_label.h

@@ -476,6 +476,7 @@ public:
 	void selection_copy();
 	void set_deselect_on_focus_loss_enabled(const bool p_enabled);
 	bool is_deselect_on_focus_loss_enabled() const;
+	void deselect();
 
 	Error parse_bbcode(const String &p_bbcode);
 	Error append_bbcode(const String &p_bbcode);