Add search term highlighting to EditGCodeDialog

Now leaves text stored in ParamsNode un-formatted and uses flags to determine the formatting. The GetFormattedText function now returns the markup text.

src/slic3r/GUI/EditGCodeDialog.hpp

@@ -113,6 +113,10 @@ class ParamsNode
     bool                m_expanded_before_search{false};
     bool                m_enabled{true};
 
+    bool                 m_bold{false};
+    // first is pos, second is length
+    std::unique_ptr<std::pair<int, int>> m_highlight_index{nullptr};
+
 public:
 
 #ifdef __linux__
@@ -139,6 +143,8 @@ public:
                 const std::string&  param_key,
                 wxDataViewCtrl* ctrl);
 
+    wxString GetFormattedText();
+
     bool             IsContainer()      const { return m_container; }
     bool             IsGroupNode()      const { return m_parent == nullptr; }
     bool             IsParamNode()      const { return m_param_type != ParamType::Undef; }
@@ -257,11 +263,6 @@ public:
     void    set_em_unit(int em) { m_em_unit = em; }
 };
 
-static std::string unbold(const std::string& text) {
-    return text.substr(text.find("<b>")+3, text.find("</b>")-3);
-}
-
-
 } // namespace GUI
 } // namespace Slic3r