Find/replace UI should support newlines

[injust]

Check for existing issues

• [X] Completed

Describe the feature

In the find/replace fields, you should be able to:

• Type a newline
  • Currently: You have to copy+paste a newline
  • VS Code does this with Ctrl-Enter (on macOS)
• See and scroll multiple lines
  • Currently: Only one line is visible and there is no scrollbar
  • VS Code's fields each expand vertically (up to 6 lines tall)
• Navigate the text like a normal editor pane
  • Currently: cmd-up/down and page up/down do nothing
  • Currently: Up/down arrow navigate history (even if there are multiple lines)
    • In VS Code, up/down arrow navigates the text, and navigate the history only when they are at a text boundary (e.g. up arrow navigates history when the cursor is on the first line)
• Bonus round: Add scrollbars for both vertical and horizontal scrolling
  • Currently: You can scroll horizontally, but there's no visual indication

If applicable, add mockups / screenshots to help present your vision of the feature

No response

[notpeter]

In regular expression mode you can use \n for newlines. The rest still stands, but thought I'd mention it.