Improve wxGrid cell wrapping in wxGridCellAutoWrapStringRenderer.

Wrap the words too long to be shown on one line on several lines.

Also take the line breaks and TABs into account.

Closes #15249.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74245 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/gridctrl.h

@@ -249,6 +249,28 @@ private:
                                 const wxRect& rect,
                                 int row, int col);
 
+    // Helper methods of GetTextLines()
+
+    // Break a single logical line of text into several physical lines, all of
+    // which are added to the lines array. The lines are broken at maxWidth and
+    // the dc is used for measuring text extent only.
+    void BreakLine(wxDC& dc,
+                   const wxString& logicalLine,
+                   wxCoord maxWidth,
+                   wxArrayString& lines);
+
+    // Break a word, which is supposed to be wider than maxWidth, into several
+    // lines, which are added to lines array and the last, incomplete, of which
+    // is returned in line output parameter.
+    //
+    // Returns the width of the last line.
+    wxCoord BreakWord(wxDC& dc,
+                      const wxString& word,
+                      wxCoord maxWidth,
+                      wxArrayString& lines,
+                      wxString& line);
+
+
 };
 
 #endif  // wxUSE_GRID