On Tue, 28 Nov 2023 23:40:45 GMT, Damon Nguyen <[email protected]> wrote:

> The initial issue was a padding issue for JButton when HTML content was set 
> as the button's text. 
> [JDK-8282772](https://bugs.openjdk.org/browse/JDK-8282772), 
> [JDK-8015854](https://bugs.openjdk.org/browse/JDK-8015854), and 
> [JDK-8302173](https://bugs.openjdk.org/browse/JDK-8302173) are the issues 
> related to the fix. The initial bug report was for Metal L&F, since it has a 
> drastically different button margin from the rest (2, 14, 2, 14). This left 
> and right margin of 14px led to the initial bug report. However, it was 
> determined that the issue was not an issue, and instead, a problem with the 
> reporter's implementation since they weren't aware of the difference in 
> Metal's button margins versus other L&Fs.
> 
> This PR reverts these changes since it was determined in [this 
> PR](https://github.com/JFormDesigner/FlatLaf/issues/746) that the fix causes 
> a new issue regarding JButton contents' positioning. In addition, a new line 
> is added to BasicLookAndFeel (since Metal derives its default button margin 
> here) to better document the difference in button margins compared to other 
> L&Fs.

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicLookAndFeel.java 
line 464:

> 462:      * <p>
> 463:      * The default button margin value is (2, 14, 2, 14), which may
> 464:      * greatly differ from other LookAndFeel defaults.

This will need a CSR, which is fine.
But
(1) Basic is an abstract L&F .. it can't be the place to say what Metal does 
since most L&Fs derive from Basic
And something about a JButton ought to be closer to ButtonUI or JButton.
(2) Do we have precedent for calling out the exact number of (user space) 
pixels ?
I'd prefer some more waffly wording like 
"The default margins may vary greatly depending on the L&F".

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/16869#discussion_r1409750661

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