Fix clipboard copy on iOS 18.4+ by enforcing real selection with focus

[hersonls]

This PR fixes clipboard copying on iOS 18.4 and later, where document.execCommand('copy') silently fails if no real text selection is present.

Starting with iOS 18.4, Safari requires the target element to be focused and a selection to be explicitly set in order for the execCommand('copy') operation to succeed. This behavior change is documented in the Safari 18.4 Release Notes, which states:

Fixed document.execCommand("copy") only triggering if there is a selection.

This update modifies the fallback logic used for copying on iOS by adding:

textarea.focus();
textarea.setSelectionRange(0, 999999);

These lines ensure that the copy operation works as expected under the new requirement.

What was changed

• Added textarea.focus() before setSelectionRange(...) inside the iOS-specific branch of the clipboard fallback logic.
• No other parts of the logic were modified.

How to reproduce

On an iOS 18.4+ device or simulator:

1. Attempt to copy text using execCommand('copy') without focusing or selecting the element.
2. Observe that the operation returns true but does not actually copy the value.
3. After applying this fix, the text is properly copied to the clipboard.

Related

• Safari 18.4 Release Notes: https://developer.apple.com/documentation/safari-release-notes/safari-18_4-release-notes