Keyboard shortcuts fire even when PDF container is not focused

[mario-donnarumma]

Description

Keyboard shortcuts handled by the PDF viewer are triggered globally on the page, even when the PDF container is not focused. This causes conflicts with browser-native shortcuts and other page interactions, leading to unexpected behavior for end users.

Steps to Reproduce

1. Navigate to any documentation page that embeds a PDF viewer, e.g. https://www.embedpdf.com/docs/snippet/theme
2. Make sure the PDF container is not focused (e.g. click somewhere else on the page)
3. Press CTRL+F → the PDF's internal search dialog opens instead of the browser's native page search

The issue also affects other shortcuts, for example:

• CTRL+P → triggers the PDF's print dialog instead of the browser's native print dialog
• CTRL+1 → triggers the "fit-to-width" action instead of switching to the first browser tab

Tested on Windows (Chrome) and MacOS (Chrome, Firefox, Safari)

Proposed Solution

• Fix the event listeners so that shortcuts are only processed when the PDF container has focus
• Expose a configuration option to completely or partially disable keyboard shortcuts