FlatButtonUI weird border issues

[Frank-99]

I was trying to have a button with a toolBar style, but when I did this:

FlatButton button = new FlatButton();
button.setButtonType(ButtonType.toolBarButton);

I got a focusBorder, which a normal toolBarButton in a toolBar doesn't have: So I played with settings and I found out that if I set these properties in the Laf file (or if I instead use setFocusable(false)):

Component.focusWidth = 0
Component.innerFocusWidth = 0
HelpButton.focusWidth = 0
HelpButton.innerFocusWidth = 0
Button.focusWidth = 0
Button.innerFocusWidth = 0
Button.default.focusWidth = 0
Button.default.innerFocusWidth = 0
Button.toolbar.focusWidth = 0
Button.toolbar.innerFocusWidth = 0

It fixes the issue, but I still noticed weird border insets/spacing:

So I tried with this button type:

button.setButtonType(ButtonType.borderless);

But with the properties set, I still get a focus border: The only way to fix it that I found is to set it not focusable manually: button.setFocusable(false); which results in this:

This is what I was looking for, it doesn't feel intuitive, I thought I would achive this result by default just by setting the style to toolBarButton, so either I'm missing something or there is some weird logic around the focus border drawing...