Test: Keyboard navigation in sticky-scroll

[aiday-mar]

Refs: #169107

• anyOS @gregvanl
• anyOS @dbaeumer

Complexity: 1

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It is now possible to navigate to a sticky line using the keyboard. Steps to test:

1. Enabled sticky-scroll if not enabled. Open a file with sticky lines.
2. Scroll so as to make sticky lines visible
3. Click on Focus: Sticky Scroll from the command palette
4. Use the Up and Down arrow keys to select a line
5. Click on Enter to jump to a line
6. Scroll the file with a focused sticky line and check that the focus remains correctly on the sticky lines. The code has been designed in a manner so that if the focused sticky line disappears, focus goes to the bottom-most visible sticky line. Verify focus disappears during scrolling, when there are no sticky lines.