Fix bug where adding comment on opposite line would error — radicle-desktop

When adding a comment to the side that doesn’t have changes we force the comment to be added to the opposite side. E.g. adding a comment on the right-hand-side for a deletion will force the comment to be added to the left-hand-side.

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     e.preventDefault();
     e.stopPropagation();
     const commentAnchor = determineSelectedAnchor(side, line);
     selection = {
       file: filePath(file, side),
       start: determineSelectedAnchor(side, line),
       end: determineSelectedAnchor(side, line),
       start: commentAnchor,
       end: commentAnchor,
       hunkIdx: hunkIdx,
       lineIdx: lineIdx,
       codeLocation: {
         commit: head,
         path: filePath(file, side),
         old:
           side === "left"
           commentAnchor.side === "left"
             ? {
                 type: "lines",
                 range: {
                   start: lineNumber(line, "left") as number,
                   end: (lineNumber(line, "left") as number) + 1,
                   start: commentAnchor.lineNumber,
                   end: commentAnchor.lineNumber + 1,
                 },
               }
             : null,
         new:
           side === "right"
           commentAnchor.side === "right"
             ? {
                 type: "lines",
                 range: {
                   start: lineNumber(line, "right") as number,
                   end: (lineNumber(line, "right") as number) + 1,
                   start: commentAnchor.lineNumber,
                   end: commentAnchor.lineNumber + 1,
                 },
               }
             : null,