KFileItemModel: Always use upper case letters to group by name

This fixes the following problems:
1. In a folder containing the items ~a and b, the first group,
   containing ~a, is named "Others".
2. In a folder containing the items a, ~b, ~c, and ~d, the first group
   "A" contains a and ~b, and the other two items are in the group
   "Others".

1 files changed, 1 insertions, 1 deletions

diff --git a/src/kitemviews/kfileitemmodel.cpp b/src/kitemviews/kfileitemmodel.cpp
index 2e583d05e..748a9bae1 100644
--- a/src/kitemviews/kfileitemmodel.cpp
+++ b/src/kitemviews/kfileitemmodel.cpp
@@ -1556,7 +1556,7 @@ QList<QPair<int, QVariant> > KFileItemModel::nameRoleGroups() const
         // Use the first character of the name as group indication
         QChar newFirstChar = name.at(0).toUpper();
         if (newFirstChar == QLatin1Char('~') && name.length() > 1) {
-            newFirstChar = name.at(1);
+            newFirstChar = name.at(1).toUpper();
         }
 
         if (firstChar != newFirstChar) {