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Flow layout does not re-render when no childs initially #9553

mbgonicus opened this issue Aug 1, 2018 · 0 comments


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commented Aug 1, 2018

In this playground example (see also below) I create a container with a flow layout and let it render. After a second, it adds a label in the then empty container.

Expectation: After the timeout, I can see the label.
Is: After the timeout, the label is invisible .


  • In the dom, the elements are present, but the container has a height of 0.
  • If you uncomment the line such that the container has a widget initially, both labels are visible as expected.
  • The behaviour is identical in master and devel playground.
var container = new qx.ui.container.Composite(new qx.ui.layout.Flow());
var label1 = new qx.ui.basic.Label("Label 1");
var label2 = new qx.ui.basic.Label("Label 2");

// container.add(label1);

qx.event.Timer.once(function() {
}, null, 1000);

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