Bug 136941 - Filters from filepicker.properties should should have case insensitive test

r+sr=roc a1.9.1=beltzner

widget/src/gtk2/nsFilePicker.cpp

@@ -320,6 +320,32 @@ UpdateFilePreviewWidget(GtkFileChooser *file_chooser,
   _gtk_file_chooser_set_preview_widget_active(file_chooser, TRUE);
 }
 
+static nsCAutoString
+MakeCaseInsensitiveShellGlob(const char* aPattern) {
+  // aPattern is UTF8
+  nsCAutoString result;
+  unsigned int len = strlen(aPattern);
+
+  for (unsigned int i = 0; i < len; i++) {
+    if (!g_ascii_isalpha(aPattern[i])) {
+      // non-ASCII characters will also trigger this path, so unicode
+      // is safely handled albeit case-sensitively
+      result.Append(aPattern[i]);
+      continue;
+    }
+
+    // add the lowercase and uppercase version of a character to a bracket
+    // match, so it matches either the lowercase or uppercase char.
+    result.Append('[');
+    result.Append(g_ascii_tolower(aPattern[i]));
+    result.Append(g_ascii_toupper(aPattern[i]));
+    result.Append(']');
+
+  }
+
+  return result;
+}
+
 NS_IMPL_ISUPPORTS1(nsFilePicker, nsIFilePicker)
 
 nsFilePicker::nsFilePicker()
@@ -628,7 +654,8 @@ nsFilePicker::Show(PRInt16 *aReturn)
 
     GtkFileFilter *filter = _gtk_file_filter_new ();
     for (int j = 0; patterns[j] != NULL; ++j) {
-      _gtk_file_filter_add_pattern (filter, g_strstrip (patterns[j]));
+      nsCAutoString caseInsensitiveFilter = MakeCaseInsensitiveShellGlob(g_strstrip(patterns[j]));
+      _gtk_file_filter_add_pattern (filter, caseInsensitiveFilter.get());
     }
 
     g_strfreev(patterns);