Fix using *.* in wxDir under MSW

Using "*.*" as a wildcard is supposed to match everything under MSW, but
ever since the changes of 4daceaacbd (Check that files returned from
wxDir::FindXXX() match the filter., 2013-04-08, see #3432) it only
matched the files with extension because we double-checked the match
returned by the native MSW function (which does handle "*.*" correctly)
using our own wxString::Matches() which doesn't handle it specially.

Fix this by skipping the call to Matches() when "*.*" is used: we know
that this wildcard matches everything, so rechecking the match would be
useless at best, even if it were not actively harmful. And also skip
this call for "*" because calling Matches("*") always succeeds anyhow.

This also fixes the same bug in wxFind{First,Next}File() and any other
code using them such as wx{File,Dir}Ctrl.

Closes #23905.

src/msw/dir.cpp

@@ -86,7 +86,13 @@ CheckFoundMatch(const FIND_STRUCT* finddata, const wxString& filter)
     // However if the filter contains only special characters (which is a
     // common case), we can skip the case conversion.
     if ( filter.find_first_not_of(wxS("*?.")) == wxString::npos )
-        return fn.Matches(filter);
+    {
+        // And maybe even skip the check entirely if we have a filter that we
+        // know matches everything. This is more than just an optimization, as
+        // "*.*" it wouldn't match the files without extension according to
+        // wxString::Matches(), but it should.
+        return filter == wxS("*.*") || filter == wxS("*") || fn.Matches(filter);
+    }
 
     return fn.MakeUpper().Matches(filter.Upper());
 }

tests/file/dir.cpp

@@ -20,6 +20,16 @@
 #define DIRTEST_FOLDER      wxString("dirTest_folder")
 #define SEP                 wxFileName::GetPathSeparator()
 
+// We can't use wxFileSelectorDefaultWildcardStr from wxCore here, so define
+// our own.
+const char WILDCARD_ALL[] =
+#if defined(__WXMSW__)
+"*.*"
+#else // Unix/Mac
+"*"
+#endif
+;
+
 // ----------------------------------------------------------------------------
 // test fixture
 // ----------------------------------------------------------------------------
@@ -145,6 +155,9 @@ TEST_CASE_METHOD(DirTestCase, "Dir::Traverse", "[dir]")
     wxArrayString files;
     CHECK( wxDir::GetAllFiles(DIRTEST_FOLDER, &files) == 4 );
 
+    // enum all files using an explicit wildcard
+    CHECK(wxDir::GetAllFiles(DIRTEST_FOLDER, &files, WILDCARD_ALL) == 4);
+
     // enum all files according to the filter
     CHECK( wxDir::GetAllFiles(DIRTEST_FOLDER, &files, "*.foo") == 1 );