fix: block copy using settings button

[laishere]

Block copy (CMD + C) via settings button is broken in recent editorjs releases.

After debugging, I found the issue is related to this logic:

editor.js/src/components/utils/popover/popover-abstract.ts

Lines 121 to 123 in 6313409

	if (this.search !== undefined) {
	this.search.focus();
	}

It tries to focus the search input in the popover, but it won't work.
We need to wrap it with requestAnimationFrame.

The old logic did the same:

editor.js/src/components/utils/popover/index.ts

Lines 239 to 243 in e9b4c30

	if (this.search !== undefined) {
	requestAnimationFrame(() => {
	this.search?.focus();
	});
	}

Why does this matter?

I found the answer after debugging both the old version and the latest version.

1. When a keydown event is detected on the document listener, it tries to decide if the event happens inside the editor element by:
   

   editor.js/src/components/modules/ui.ts

   Line 501 in 6313409

   const keyDownOnEditor = (event.target as HTMLElement).closest(`.${this.CSS.editorWrapper}`);

2. Since the popover does not manage to get the focus on the search element, so when we press CMD + C with the popover is showing, the event.target is actually document itself. So keyDownOnEditor is null.

3. When keyDownOnEditor === null:
   

   editor.js/src/components/modules/ui.ts

   Lines 507 to 511 in 6313409

   	if (currentBlock !== undefined && keyDownOnEditor === null) {
   	this.Editor.BlockEvents.keydown(event);
   	return;
   	}

   
   It will call this.Editor.BlockEvents.keydown(event), which will close the popover and unselectBlock.
   

   editor.js/src/components/modules/toolbar/blockSettings.ts

   Lines 184 to 186 in 6313409

   	if (!this.Editor.CrossBlockSelection.isCrossBlockSelectionStarted && this.Editor.BlockManager.currentBlock) {
   	this.Editor.BlockSelection.unselectBlock(this.Editor.BlockManager.currentBlock);
   	}

   
   So we won't have a selected block any more when we do the keydown event handling later.

This PR fixs this issue by making the focus on the search element actually work again when we click the settings button.