HeaderView - call invalidateCachedSizeHint() on clear

This calls invalidateCachedSizeHint on clear, which is a logical
thing to do.

This is a backport of SHA aa2578a1006f17cff50ca39090bae2e1e090b59b

Task-number: QTBUG-22528

Change-Id: I725748b314fd9d09441d3bf34c4607a4cc7162ed
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gui/itemviews/qheaderview.cpp b/src/gui/itemviews/qheaderview.cpp
index 2bc4619455..542d98be24 100644
--- a/src/gui/itemviews/qheaderview.cpp
+++ b/src/gui/itemviews/qheaderview.cpp
@@ -3288,6 +3288,7 @@ void QHeaderViewPrivate::clear()
     sectionHidden.clear();
     hiddenSectionSize.clear();
     sectionSpans.clear();
+    invalidateCachedSizeHint();
     }
 }