[kde] RomDataView: QTreeView is defaulting to sorting by column 0, descending.

Make it sort in ascending order by default instead.

NOTE: Using column -1 to suppress the sort indicator visibility.

Might want to guard this with QT_VERSION_CHECK(6, 0, 0), but it seems
to have no effect on KF5 on my system, but it might on some other
systems with weird shenanigans happening...

NEWS.md

@@ -20,6 +20,9 @@
     * The SparseDiscReader changes in v2.3 broke this, so anything that
       uses an ISO-9660 format showed 2048-byte sectors, even if this
       wasn't the case.
+  * KDE: On KF6, ListData widgets that didn't specify a default sorting
+    method ended up being sorted in reverse-order by default. Not sure
+    why this changed in Qt6. A workaround has been applied to fix it.
 
 * Other changes:
   * Added support for localsearch-3.8, the new name of Tracker.

src/kde/RomDataView.cpp

@@ -565,6 +565,10 @@ QTreeView *RomDataViewPrivate::initListData(QLabel *lblDesc,
 			}
 			col++;
 		}
+
+		// FIXME: Qt6 is defaulting to sorting by column 0, descending.
+		// Qt5 didn't have this issue...
+		treeView->header()->setSortIndicator(-1, Qt::AscendingOrder);
 	} else {
 		// Hide the header.
 		treeView->header()->hide();