Related: fdo#81457 skip setting an empty allocation

if the dimension is 0, don't bother calculating
a bunch of <= 0 sizes, rely on the parents clipping
to hide the lot instead

Change-Id: I5b593a5b6b6c3614beb7f9bf3328fa469b700972

1 files changed, 7 insertions, 4 deletions

diff --git a/vcl/source/window/tabpage.cxx b/vcl/source/window/tabpage.cxx
index 5e5526d6607d..f69258eb14b5 100644
--- a/vcl/source/window/tabpage.cxx
+++ b/vcl/source/window/tabpage.cxx
@@ -199,22 +199,25 @@ Size TabPage::GetOptimalSize() const
 void TabPage::SetPosSizePixel(const Point& rAllocPos, const Size& rAllocation)
 {
     Window::SetPosSizePixel(rAllocPos, rAllocation);
-    if (isLayoutEnabled(this))
+    if (isLayoutEnabled(this) && rAllocation.Width() && rAllocation.Height())
         VclContainer::setLayoutAllocation(*GetWindow(WINDOW_FIRSTCHILD), Point(0, 0), rAllocation);
 }
 
 void TabPage::SetSizePixel(const Size& rAllocation)
 {
     Window::SetSizePixel(rAllocation);
-    if (isLayoutEnabled(this))
+    if (isLayoutEnabled(this) && rAllocation.Width() && rAllocation.Height())
         VclContainer::setLayoutAllocation(*GetWindow(WINDOW_FIRSTCHILD), Point(0, 0), rAllocation);
 }
 
 void TabPage::SetPosPixel(const Point& rAllocPos)
 {
     Window::SetPosPixel(rAllocPos);
-    if (isLayoutEnabled(this))
-        VclContainer::setLayoutAllocation(*GetWindow(WINDOW_FIRSTCHILD), Point(0, 0), GetOutputSizePixel());
+    Size aAllocation(GetOutputSizePixel());
+    if (isLayoutEnabled(this) && aAllocation.Width() && aAllocation.Height())
+    {
+        VclContainer::setLayoutAllocation(*GetWindow(WINDOW_FIRSTCHILD), Point(0, 0), aAllocation);
+    }
 }
 
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