xterm audit: slow scroll (DECSCLM)

src/terminal/modes.zig

@@ -185,6 +185,7 @@ const entries: []const ModeEntry = &.{
     // DEC
     .{ .name = "cursor_keys", .value = 1 }, // DECCKM
     .{ .name = "132_column", .value = 3 },
+    .{ .name = "slow_scroll", .value = 4 },
     .{ .name = "reverse_colors", .value = 5 },
     .{ .name = "origin", .value = 6 },
     .{ .name = "wraparound", .value = 7, .default = true },

website/app/vt/modes/decsclm/page.mdx

@@ -0,0 +1,12 @@
+import VTMode from "@/components/VTMode";
+
+# Slow Scroll (DECSCLM)
+
+<VTMode value={4} />
+
+Enable slow or smooth scrolling.
+
+Typically, slow scrolling will scroll line by line when using scroll
+functions (arrow keys, scrollbar, etc.). With this disabling, scrolling
+jumps by more lines. This is purely up to the terminal to implement how it
+sees fit.