Describe the bug
In Microsoft Edge the select all shortcut ctrl+A selects all blocks instead of only selecting all of the content in a block.

This is not consistent with the behaviour in Chrome and Firefox. In other browsers only when using the shortcut again are all of the blocks selected.

To reproduce

• Click in a paragraph block
  • Press once selects all text
• Click in another paragraph block
  • Press once selects all bocks
• Click in another paragraph block
  • Press once selects all bocks

Expected Behaviour

• Click in a paragraph block
  • Press once selects all text.
• Click in another paragraph block
  • Press once selects all text
  • Press twice selects all bocks

Here is a screencast: https://youtu.be/djIfj67Qdbk

Environment

• OS: Windows 10
• Browser: Edge
• Version: 18 (42.17134.1.0)
• WordPress: 5.3
• Gutenberg: 7.3