Details view: Don't reset to automatic resizing when adding columns

Until now when a new column is added in the case where custom column widths
are used, the automatic resizing has been turned on again. The patch fixes
this so that the current widths stay and the new column gets a proper default
width.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/kitemviews/kitemlistheaderwidget.cpp b/src/kitemviews/kitemlistheaderwidget.cpp
index 18b37c246..d3a8f001b 100644
--- a/src/kitemviews/kitemlistheaderwidget.cpp
+++ b/src/kitemviews/kitemlistheaderwidget.cpp
@@ -98,9 +98,14 @@ bool KItemListHeaderWidget::automaticColumnResizing() const
 
 void KItemListHeaderWidget::setColumns(const QList<QByteArray>& roles)
 {
+    foreach (const QByteArray& role, roles) {
+        if (!m_columnWidths.contains(role)) {
+            m_columnWidths.remove(role);
+            m_preferredColumnWidths.remove(role);
+        }
+    }
+
     m_columns = roles;
-    m_columnWidths.clear();
-    m_preferredColumnWidths.clear();
     update();
 }