introduce blank comparison

[timmey09]

Feature description

Add a "New Blank Comparison" feature that opens two empty text panes. This would allow users to paste data directly from the clipboard and compare it instantly without the friction of creating temporary files.

Why is this useful?

While VisualDiffer offers a much better diff presentation than Meld, Meld is currently more efficient for transient data (logs, JSON snippets, etc.) because it supports "Blank Comparisons." Adding this would make VisualDiffer the superior tool for all use cases.

Alternatives considered

I could save the data to a temporary file first, but it is inconvenient and adds unnecessary friction to the workflow.

Environment (if relevant)

No response

Priority

Medium

Screenshots or mockups (optional)

No response

Additional notes (optional)

No response

[dafi]

I've been thinking about this for a while. I often save to a temporary file, or even two.
When using clipboard managers (raycast), I often have both "sides" in the clipboard, and I'm forced to create unnecessary files.

Give me some time and I'll implement this feature.