Open bookmarks in new foreground tabs

[GreenRecycleBin]

This commit should fix #3207.

There doesn't seem to be any middle-clicking bookmark item(s) test under https://github.com/brave/browser-laptop/blob/ca626503925c6f706a65896b1b679692374d6697/test/components/bookmarksToolbarTest.js.

In order to add some tests according to the test plans I've outlined in the commits, I'd need to know how to:

• Simulate middle clicking on bookmark item(s)
• Whether to do a URL match of a new foreground tab to that of the original bookmark item or check that such an event is fired

I can probably study other tests and figure out how to do these. But it'd be helpful if someone could give me a few pointers. Thank you.

[GreenRecycleBin]

A related question is whether we should implement Shift + middle clicking a bookmark folder to open in new foreground tabs regardless of the value of SWITCH_TO_NEW_TABS setting? This parallels the current behavior of Shift + middle clicking a bookmark item to always open it in a new foreground tab.

[GreenRecycleBin]

@bbondy Could you help review this?

[bsclifton]

Awesome, thanks for the fix, @GreenRecycleBin!

I manually tested and verified this works as I'd expect. If you wanted to add a test (which I'd highly encourage you to do and submit another PR for), you identified a good place to add the test 😄

Here's a link to our test doc, which includes a link to the webdriver documentation. To simulate a middle click, you'd want to use the middleClick action:
http://webdriver.io/api/action/middleClick.html