diff --git a/src/terminal/PageList.zig b/src/terminal/PageList.zig
index fdba5dbf2..0f1d7ea8a 100644
--- a/src/terminal/PageList.zig
+++ b/src/terminal/PageList.zig
@@ -2999,7 +2999,7 @@ pub const Pin = struct {
 
     /// Mark this pin location as dirty.
     /// TODO: test
-    pub fn markDirty(self: *Pin) void {
+    pub fn markDirty(self: Pin) void {
         var set = self.page.data.dirtyBitSet();
         set.set(self.y);
     }
diff --git a/src/terminal/Terminal.zig b/src/terminal/Terminal.zig
index cdeab624f..cf3a0d2ea 100644
--- a/src/terminal/Terminal.zig
+++ b/src/terminal/Terminal.zig
@@ -1445,6 +1445,10 @@ pub fn insertLines(self: *Terminal, count: usize) void {
             self.rowWillBeShifted(&p.page.data, src);
             self.rowWillBeShifted(&dst_p.page.data, dst);
 
+            // Mark both our src/dst as dirty
+            p.markDirty();
+            dst_p.markDirty();
+
             // If our scrolling region is full width, then we unset wrap.
             if (!left_right) {
                 dst.wrap = false;
@@ -1509,6 +1513,9 @@ pub fn insertLines(self: *Terminal, count: usize) void {
     while (it.next()) |p| {
         const row: *Row = p.rowAndCell().row;
 
+        // This row is now dirty
+        p.markDirty();
+
         // Clear the src row.
         const page = &p.page.data;
         const cells = page.getCells(row);
@@ -1866,6 +1873,9 @@ pub fn eraseChars(self: *Terminal, count_req: usize) void {
         break :end end;
     };
 
+    // Mark our cursor row as dirty
+    self.screen.cursorMarkDirty();
+
     // Clear the cells
     const cells: [*]Cell = @ptrCast(self.screen.cursor.page_cell);
 
@@ -3736,10 +3746,20 @@ test "Terminal: linefeed and carriage return" {
     var t = try init(testing.allocator, .{ .cols = 80, .rows = 80 });
     defer t.deinit(testing.allocator);
 
-    // Basic grid writing
+    // Print and CR.
     for ("hello") |c| try t.print(c);
+    t.clearDirty();
     t.carriageReturn();
+
+    // CR should not mark row dirty because it doesn't change rendering.
+    try testing.expect(!t.isDirty(.{ .screen = .{ .x = 0, .y = 0 } }));
+
     try t.linefeed();
+
+    // LF should not mark row dirty
+    try testing.expect(!t.isDirty(.{ .screen = .{ .x = 0, .y = 0 } }));
+    try testing.expect(!t.isDirty(.{ .screen = .{ .x = 0, .y = 1 } }));
+
     for ("world") |c| try t.print(c);
     try testing.expectEqual(@as(usize, 1), t.screen.cursor.y);
     try testing.expectEqual(@as(usize, 5), t.screen.cursor.x);
@@ -3757,7 +3777,10 @@ test "Terminal: linefeed unsets pending wrap" {
     // Basic grid writing
     for ("hello") |c| try t.print(c);
     try testing.expect(t.screen.cursor.pending_wrap == true);
+    t.clearDirty();
     try t.linefeed();
+    try testing.expect(!t.isDirty(.{ .screen = .{ .x = 0, .y = 0 } }));
+    try testing.expect(!t.isDirty(.{ .screen = .{ .x = 0, .y = 1 } }));
     try testing.expect(t.screen.cursor.pending_wrap == false);
 }
 
@@ -4132,8 +4155,16 @@ test "Terminal: setTopAndBottomMargin simple" {
     try t.linefeed();
     try t.printString("GHI");
     t.setTopAndBottomMargin(0, 0);
+
+    t.clearDirty();
     t.scrollDown(1);
 
+    // Mark the rows we moved as dirty.
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4154,8 +4185,15 @@ test "Terminal: setTopAndBottomMargin top only" {
     try t.linefeed();
     try t.printString("GHI");
     t.setTopAndBottomMargin(2, 0);
+
+    t.clearDirty();
     t.scrollDown(1);
 
+    try testing.expect(!t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4176,8 +4214,14 @@ test "Terminal: setTopAndBottomMargin top and bottom" {
     try t.linefeed();
     try t.printString("GHI");
     t.setTopAndBottomMargin(1, 2);
+
+    t.clearDirty();
     t.scrollDown(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(!t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4198,8 +4242,15 @@ test "Terminal: setTopAndBottomMargin top equal to bottom" {
     try t.linefeed();
     try t.printString("GHI");
     t.setTopAndBottomMargin(2, 2);
+
+    t.clearDirty();
     t.scrollDown(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4221,8 +4272,13 @@ test "Terminal: setLeftAndRightMargin simple" {
     try t.printString("GHI");
     t.modes.set(.enable_left_and_right_margin, true);
     t.setLeftAndRightMargin(0, 0);
+
+    t.clearDirty();
     t.eraseChars(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(!t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4247,8 +4303,15 @@ test "Terminal: setLeftAndRightMargin left only" {
     try testing.expectEqual(@as(usize, 1), t.scrolling_region.left);
     try testing.expectEqual(@as(usize, t.cols - 1), t.scrolling_region.right);
     t.setCursorPos(1, 2);
+
+    t.clearDirty();
     t.insertLines(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4271,8 +4334,15 @@ test "Terminal: setLeftAndRightMargin left and right" {
     t.modes.set(.enable_left_and_right_margin, true);
     t.setLeftAndRightMargin(1, 2);
     t.setCursorPos(1, 2);
+
+    t.clearDirty();
     t.insertLines(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4295,8 +4365,15 @@ test "Terminal: setLeftAndRightMargin left equal right" {
     t.modes.set(.enable_left_and_right_margin, true);
     t.setLeftAndRightMargin(2, 2);
     t.setCursorPos(1, 2);
+
+    t.clearDirty();
     t.insertLines(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);
@@ -4319,8 +4396,15 @@ test "Terminal: setLeftAndRightMargin mode 69 unset" {
     t.modes.set(.enable_left_and_right_margin, false);
     t.setLeftAndRightMargin(1, 2);
     t.setCursorPos(1, 2);
+
+    t.clearDirty();
     t.insertLines(1);
 
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 0 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 1 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 2 } }));
+    try testing.expect(t.isDirty(.{ .active = .{ .x = 0, .y = 3 } }));
+
     {
         const str = try t.plainString(testing.allocator);
         defer testing.allocator.free(str);