Diff view marks padding rows with "-" and indents hunks with two-digit line numbers one column further #491

What's wrong

In the side-by-side diff (Compare File), the padding rows that line one side up with a longer hunk on the other side carry a - marker, as if a line had been deleted there. Each block has its own fixed-fit table, so a hunk whose line numbers reach two digits gets a wider number column and its text sits one column further right than its neighbours.

• Expected: a padding row shows no marker (no line was removed on that side), and hunks keep their text in the same column.
• Actual: ShowDiffLines(Enumerable.Repeat(string.Empty, extraLines), -1, "-", ...) at ProjectDirector/ProjectDirector.cs:1930 (left, under a green filler colour) and :2001 (right) writes - on every padding row. BeginTable($"DiffBlockLeft{i}", 3, ImGuiTableFlags.SizingFixedFit) (:1889, :1960) sizes the number column per hunk, which is why hunk 3 of the gallery's comparing-a-file.png (lines 5-10 on the right) is indented one column more than hunks 1 and 2.

Seen in docs/gallery/comparing-a-file.png: hunk 2 on the left has two - rows tinted green under Alpha's single deleted line.

Suggested fix

Pass an empty prefix for filler rows, and give the number column a fixed width (for example from the larger file's line count) so every hunk lines up.

Generated by Claude Code