[Godot 3.1.1-Windows10/64]
While adding a child like LineEdit ,TextEdit,Button etc to the Hboxcontainer ,and changing it's "x" width ,the child's width keeps defaulting to it's original "x" value of "58".
Also ,when a new child is added by duplicating the existing child (whose width was manually changed {other than 58}),the new child defaults to a width of "58" and is placed at a "x" position of 62 (58width +4margin ) from the left edge of the Hboxcontainer .This behavior is seen for additional children as well.
Following Default Values were used for the above test
(testing with other values also generated similar , above mentioned behavior)
Hboxcontainer---> Alignment -Begin,GrowDirection -End , SizeFlag - Fill
ChildNode---> Alignment -Left ,GrowDirection -End , SizeFlag - Fill
Anchor,Margin etc have not been changed and have been kept at their default values.
Note -RightMargin also defaults to 58 .
Is this a bug or am I missing something?