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Add two new methods to copy buffer content regions:
- cj/copy-to-bottom-of-buffer: copies from point to end of buffer
- cj/copy-to-top-of-buffer: copies from beginning of buffer to point
Reorganize copy operations under C-; b c submenu:
- C-; b c w: copy whole buffer
- C-; b c t: copy to top (beginning to point)
- C-; b c b: copy to bottom (point to end)
Other copy operations (buffer name, file path, file link) remain at
C-; b base level for quick access.
Add comprehensive ERT tests (22 tests total):
- test-custom-buffer-file-copy-to-bottom-of-buffer.el (11 tests)
- test-custom-buffer-file-copy-to-top-of-buffer.el (11 tests)
- Tests cover normal, boundary, and error cases including unicode,
narrowing, whitespace, and read-only buffers
All tests pass.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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