commit bcf8542e68a04dc35da3b03258b626ff5b213511
author Claudio Guglielmo <claudio.guglielmo@bsiag.com> Mon Mar 11 17:25:33 2019 +0100
committer Claudio Guglielmo <claudio.guglielmo@bsiag.com> Mon Mar 11 18:42:01 2019 +0100
tree a09ba0d48facf35ce60b56f94c22620e087f9378
parent bd741acabd222e0671442938d79980e0e79f9242

Tree: wrong node width when rendered while invisible

Use case:
TreeField inside a WrappedFormField on a dialog.
The wrapped form field is invisible, the innerForm is set and afterwards
the field made invisible (formField.setInnerForm(form);
formField.setVisible()).
-> the tree is rendered before it is made visible.
-> normally, the group box tries to render the controls before rendering
the visible flag.

To fix it, renderViewPort is not executed if the tree is invisible. As
soon as the tree will get visible, the layout will be executed which
calls renderViewPort.

The table has a similar problem. The scroll height will be wrong because
of a wrong row height.

The renderViewport in TableLayout.prefSize is necessary for the
following case: Set useUiHeight to true, make table invisible, add some
rows, make table visible again -> prefSize would be too small because
rows are not rendered when prefSize is called. This is not necessary for
the tree because the nodes are already inserted (by
_addToVisibleFlatList).

233333