dolphinview: add preferred sort order for roles

BUG: 425457

This commit ensures that both the menu and column headers in table view
will have the same default sorting (ascending/descending) for each role.
It also saves the user's preferences for each role throughout the session.

Previously, sorting by "Modified" would always sort by "Oldest First."
If the user then changed to "Newest First" and sorted again by "Name,"
files would be sorted in reverse alphabetical order (Z-A).

Now, sorting by "Modified" defaults to "Newest First." If a user switches
between multiple roles, the default for each role will be used unless
the user changes to a non-default sort order. In that case, the user's
preference will be applied.

Defaults:

**Descending Order:**

Time-based roles
- modificationtime
- creationtime
- accesstime
- deletiontime
- imageDateTime
- releaseYear
 
Size/dimension roles
- size
- width
- height
- pageCount
- wordCount
- lineCount

Quality/Quantity roles
- rating
- duration
- bitrate
- frameRate

**Ascending order:**

- Text based roles (A-Z)
- All other roles

1 files changed, 2 insertions, 8 deletions

diff --git a/src/kitemviews/private/kitemlistheaderwidget.cpp b/src/kitemviews/private/kitemlistheaderwidget.cpp
index 378dd1d5d..08afdc5cf 100644
--- a/src/kitemviews/private/kitemlistheaderwidget.cpp
+++ b/src/kitemviews/private/kitemlistheaderwidget.cpp
@@ -261,17 +261,11 @@ void KItemListHeaderWidget::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
             m_model->setSortOrder(current);
             Q_EMIT sortOrderChanged(current, previous);
         } else {
-            // Change the sort role and reset to the ascending order
+            // Change the sort role and use the appropriate default sort order
             const QByteArray previous = m_model->sortRole();
             const QByteArray current = m_columns[m_pressedRoleIndex];
-            const bool resetSortOrder = m_model->sortOrder() == Qt::DescendingOrder;
-            m_model->setSortRole(current, !resetSortOrder);
+            m_model->setSortRole(current, true);
             Q_EMIT sortRoleChanged(current, previous);
-
-            if (resetSortOrder) {
-                m_model->setSortOrder(Qt::AscendingOrder);
-                Q_EMIT sortOrderChanged(Qt::AscendingOrder, Qt::DescendingOrder);
-            }
         }
     }