RFR: JDK-8277420: Provide a way to copy the hyperlink to a doc element to the clipboard [v2]

[Pavel Rappo]

On Mon, 23 May 2022 19:09:41 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

>> This is a CSS/JavaScript only change to implement copy-to-clipboard functionality for all headers (`h1` - `h6`) that have an `id` attribute associated with them. The following element-attribute patterns are supported (using `<h2>` as an example):
>> 
>>  - `<section id="..."><h2>` (generated by javadoc)
>>  - `<h2 id="...">` (commonly used)
>>  - `<h2><a id="...">` (legacy)
>> 
>> The change includes a consolidation of the CSS styles used to render copy-to-clipboard buttons, of which we have now three kinds: for snippets, for the link on the search page, and for headers. There is now a base CSS class called "copy" that defines the styles shared by all copy-to-clipboard buttons, and additional CSS properties for the concrete "subclasses". 
>> 
>> API docs generated with this change can be viewed here (top level files and java.base module):
>> http://cr.openjdk.java.net/~hannesw/8277420/api.03/
>
> Hannes Wallnöfer has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix jquery selector for anchor within header

Ensure TestSnippetUnnamedPackage passes before integrating.

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PR: https://git.openjdk.java.net/jdk/pull/8817