allow throwing away size cache of hosted container

Change-Id: I9d6eb1af80526c4853d695af3e269187569a538c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112271
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/vcl/source/window/dockwin.cxx b/vcl/source/window/dockwin.cxx
index 6834317c87ff..3b622cf1cd73 100644
--- a/vcl/source/window/dockwin.cxx
+++ b/vcl/source/window/dockwin.cxx
@@ -1115,6 +1115,22 @@ ResizableDockingWindow::ResizableDockingWindow(vcl::Window* pParent, WinBits nSt
 {
 }
 
+// needed to blow away the cached size of the boundary between vcl and hosted child widget
+void ResizableDockingWindow::InvalidateChildSizeCache()
+{
+    // find the bottom vcl::Window of the hierarchy and queue_resize on that
+    // one will invalidate all the size caches upwards
+    vcl::Window* pChild = GetWindow(GetWindowType::FirstChild);
+    while (true)
+    {
+        vcl::Window* pSubChild = pChild->GetWindow(GetWindowType::FirstChild);
+        if (!pSubChild)
+            break;
+        pChild = pSubChild;
+    }
+    pChild->queue_resize();
+}
+
 ResizableDockingWindow::~ResizableDockingWindow()
 {
     disposeOnce();