5ec4c02a43
The `CopierService` is used for copying text to the user's clipboard. It is, for example, used in `CodeComponent` to copy example code snippets. This is implemented by creating a temporary, hidden `<textarea>` elements, setting its value to the text that needs to be copied, executing the `copy` command and finally removing the element from the DOM. Previously, as a result of `CopierService`'s implementation, the focused element would lose focus, while the temporary `<textarea>` element would implicitly gain focus when selecting its contents. This had an even worse side-effect on IE11, which seems to scroll to the bottom of the containing element (here `<body>`) when the focused element is removed. This commit fixes these issues by keeping track of the previously focused element and restoring its focus after the copy operation. NOTE: This fix is inspired by Angular CDK's [PendingCopy][1] class. [1]: https://github.com/angular/components/blob/89b5fa89d1437c3054c5/src/cdk/clipboard/pending-copy.ts Fixes #37796 PR Close #38244
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