1 files changed, 28 insertions, 0 deletions
diff --git a/test/panes.zig b/test/panes.zig
index d8dab298..a6a95124 100644
--- a/test/panes.zig
+++ b/test/panes.zig
@@ -86,6 +86,8 @@ const TagLayerTests = struct {
             const source_y = @as(f32, @floatFromInt(layer.viewport.y)) + 0.5;
             const painted_x = shown.x + (x / 10 - track.to.x) / track.to.w * shown.w;
             const painted_y = shown.y + (source_y - track.to.y) / track.to.h * shown.h;
+            // Each is a first click, whatever cell the one before hit.
+            p.last_click = null;
             for ([_]pardes.Mouse.Kind{ .press, .release }) |kind| {
                 var event = mouse(layer, x, kind);
                 // Hosts inverse the exact painted pixel into the tag envelope;
@@ -1057,6 +1059,32 @@ const ClickCursorTests = struct {
         p.update(.{ .mouse = .{ .button = button, .kind = .release, .col = x, .row = y } });
     }
 
+    test "a B1 sweep held past a pane's bottom scrolls the body and keeps its start" {
+        const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 60, .rows = 12 });
+        defer p.deinit();
+        var text: std.ArrayList(u8) = .empty;
+        defer text.deinit(std.testing.allocator);
+        for (0..60) |i| try text.print(std.testing.allocator, "line{d}\n", .{i});
+        const pane = try p.setTestFile(text.items);
+        var frame = std.heap.ArenaAllocator.init(p.gpa);
+        defer frame.deinit();
+        _ = try p.render(frame.allocator());
+        const rect = p.rects[0];
+        const x = rect.x + config.GUTTER + panes.File.gutterWidth(pane);
+        const y = p.bodyTop(pane, rect);
+        // The pane reaches the screen's bottom: its last row is the edge.
+        const below = rect.y + rect.h - 1;
+        p.update(.{ .mouse = .{ .button = .left, .kind = .press, .col = x, .row = y + 1 } });
+        p.update(.{ .mouse = .{ .button = .left, .kind = .drag, .col = x + 2, .row = below } });
+        for (0..20) |_| p.update(.tick);
+        try std.testing.expect(pane.scroll() >= 20);
+        _ = try p.render(frame.allocator()); // a frame between the ticks and the release
+        p.update(.{ .mouse = .{ .button = .left, .kind = .release, .col = x + 2, .row = below } });
+        const got = pardes.edit.currentSelText(p, pane).?;
+        try std.testing.expect(std.mem.startsWith(u8, got, "line1\nline2\n"));
+        try std.testing.expect(std.mem.count(u8, got, "\n") > 20);
+    }
+
     test "everything a B1 chord does while B1 is down is one undo step" {
         const p = try Pardes.init(std.testing.allocator, .{ .tty_only = true, .cols = 60, .rows = 12 });
         defer p.deinit();