Describe the bug

When you click on the dropdown button to open the dropdown menu and then you click on the dropdown button again, the dropdown does not close.

Steps to reproduce the bug

1. Go to https://bootstrap-vue.js.org/docs/components/dropdown
2. Click on Dropdown Button in the first example
3. Click on Dropdown Button again
4. Note the dropdown menu quickly closes and reopens

Expected behavior

The dropdown menu should stay closed when the Dropdown Button is clicked the second time.

Versions

Environment:

• Device: Mac
• OS: macOS Mojave
• Browser: Safari 12.1.1 & Firefox 70.0

Additional context

This bug also occurs when b-dropdown is used within b-tabs. It can be reproduced by copying one of the examples from Dropdown and pasting it into one of the examples in Tabs.