RFR: 8273355: Flickering on tooltip appearance IntelliJ IDEA 2021.2.1

[Sergey Bylokhov]

On Wed, 23 Mar 2022 20:01:54 GMT, Alexey Ushakov <avu at openjdk.org> wrote:

> Used setOpaque() method to set correct background of platform window
> Extracted setting background to the particular method in PlatformWindow. Provided appropriate implementation in CPlatformWindow.

src/java.desktop/macosx/classes/sun/lwawt/LWWindowPeer.java line 298:

> 296:             Color color = getBackground();
> 297:             if (color != null) {
> 298:                 platformWindow.setBackground(color);

If it skips the texture property I guess it will break it?
I think the easiest solution for this issue is to add a new method to the LWWindowPeer:
 ```
   public void setBackground(final Color c) {
        Color oldBg = getBackground();
        if (oldBg == c || (oldBg != null && oldBg.equals(c))) {
            return;
        }
        super.setBackground(c);
        updateOpaque();
    }
}

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PR: https://git.openjdk.java.net/jdk/pull/7931