Update generated nvim config

config/neovim/store/lazy-plugins/NrrwRgn/test/test4/1.txt

@@ -0,0 +1,4 @@
+This is a single test.
+Line 2
+Line 3
+Line 4

config/neovim/store/lazy-plugins/NrrwRgn/test/test4/1.txt.ok

@@ -0,0 +1,6 @@
+This is a single test.
+Line 2
+Line 3
+Line 4
+Added Line
+Added another Line

config/neovim/store/lazy-plugins/NrrwRgn/test/test4/cmd.sh

@@ -0,0 +1,26 @@
+#!/nix/store/306znyj77fv49kwnkpxmb0j2znqpa8bj-bash-5.2p26/bin/bash
+#set -x
+
+Test="Test4"
+
+dir="$(realpath ../..)"
+LC_ALL=C vim -u NONE -N \
+    --cmd ':set noswapfile hidden' \
+    -c "sil :so $dir/plugin/NrrwRgn.vim" \
+    -c ':e 1.txt' \
+    -c 'sil :1,$NR!' \
+    -c 'sil :$put =\"Added Line\"' \
+    -c ':w|b#' \
+    -c ':saveas! 1.txt.mod' \
+    -c '2b|w|b#|b#' \
+    -c 'sil :$put =\"Added another Line\"' \
+    -c ':w|b#|wq!'
+
+rt=$(diff -uN0 <(cat *.mod) <(cat *.ok))
+if [ "$?" -ne 0 ]; then
+    printf "$Test failed\n"
+    printf "Diff:\n%s\n" "$rt"
+    exit 2;
+else
+    printf "$Test successful!\n"
+fi

config/neovim/store/lazy-plugins/NrrwRgn/test/test4/description.md

@@ -0,0 +1 @@
+## Test 4: Single Narrowed Window for a single buffer, switching back and forth between buffers several times (issue #44)