fix: Safari toolbar buttons & dropdowns #599
Merged
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Apparently, buttons are not focused on click in Safari (https://stackoverflow.com/questions/61245883/why-blur-and-focus-doesnt-work-on-safari). Since we use a blur event handler to hide the formatting toolbar sometimes, this wasn't working which caused the link button and block type dropdown to close the formatting toolbar on click. This PR forces toolbar buttons to become focused on mouse down, which fixes the issue. Doesn't seem to be a problem for other UI elements.
closes #530