Test multiline search improvements

[roblourens]

Test #62961 and #62304

• macOS @alexandrudima
• linux @Tyriar
• windows @joaomoreno

Complexity: 3

This only applies to the search view, there are no changes to the editor find widget.

• The search and replace inputs should expand to fit multiple lines of text, up to some max, and they can scroll after that
• They expand on typing or pasting text in, and collapse to the right size when the input shrinks
• shift+enter should insert a newline, enter should start the search
• Multiple lines of text should match whether in regex mode or not
• up/down arrow keys should move the cursor within the text input, but when it gets to the top or bottom of the input, they should navigate to the next/previous item in history
• If you copy multiple lines of text and press cmd+shift+f, they should be copied into the search input