Implement support for ellipsization mode in wxGrid

Add another wxGrid::DrawTextRectangle() overload, taking wxGridCellAttr
and ellipsizing the string if necessary, i.e. if the fitting mode of
this attribute indicates that we should do it.

Switch the code of all renderers for which it makes sense to use
ellipsization to use the new overload.

src/generic/grid.cpp

@@ -6822,6 +6822,28 @@ void wxGrid::DrawTextRectangle(wxDC& dc,
     }
 }
 
+void wxGrid::DrawTextRectangle(wxDC& dc,
+                               const wxString& text,
+                               const wxRect& rect,
+                               const wxGridCellAttr& attr,
+                               int hAlign,
+                               int vAlign)
+{
+    attr.GetNonDefaultAlignment(&hAlign, &vAlign);
+
+    // This does nothing if there is no need to ellipsize.
+    const wxString& ellipsizedText = wxControl::Ellipsize
+                                     (
+                                         text,
+                                         dc,
+                                         attr.GetFitMode().GetEllipsizeMode(),
+                                         rect.GetWidth(),
+                                         wxELLIPSIZE_FLAGS_NONE
+                                     );
+
+    DrawTextRectangle(dc, ellipsizedText, rect, hAlign, vAlign);
+}
+
 // Split multi-line text up into an array of strings.
 // Any existing contents of the string array are preserved.
 //