Better documentation for the default parameters values.

Use symbolic names for them and document them separately.

Closes #14051.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70791 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/filedlg.h

@@ -19,6 +19,13 @@ enum
 
 #define wxFD_DEFAULT_STYLE      wxFD_OPEN
 
+/**
+    Default wildcard string used in wxFileDialog corresponding to all files.
+
+    It is defined as "*.*" under MSW and OS/2 and "*" everywhere else.
+*/
+const char wxFileSelectorDefaultWildcardStr[];
+
 /**
     @class wxFileDialog
 
@@ -360,11 +367,11 @@ wxString wxFileSelector(const wxString& message,
                         const wxString& default_path = wxEmptyString,
                         const wxString& default_filename = wxEmptyString,
                         const wxString& default_extension = wxEmptyString,
-                        const wxString& wildcard = ".",
+                        const wxString& wildcard = wxFileSelectorDefaultWildcardStr,
                         int flags = 0,
                         wxWindow* parent = NULL,
-                        int x = -1,
-                        int y = -1);
+                        int x = wxDefaultCoord,
+                        int y = wxDefaultCoord);
 
 //@}