Fixed a bug setting caret position after setting or clearing selection

Implemented forced line breaks within a paragraph, entered with Shift-Return.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43540 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextctrl.h

@@ -302,6 +302,9 @@ public:
     /// Insert a newline (actually paragraph) at the current insertion point.
     virtual bool Newline();
 
+    /// Insert a line break at the current insertion point.
+    virtual bool LineBreak();
+
     /// Set basic (overall) style
     virtual void SetBasicStyle(const wxTextAttrEx& style) { GetBuffer().SetBasicStyle(style); }
     virtual void SetBasicStyle(const wxRichTextAttr& style) { GetBuffer().SetBasicStyle(style); }