Add a demo for stack restack

demos/stack_restack/stack_restack.tape

@@ -0,0 +1,40 @@
+Output stack_restack.mp4
+
+Set FontFamily "Cascadia Mono NF"
+
+Set Shell "bash"
+Set FontSize 20
+Set Width 1200
+Set Height 1200
+
+Hide
+Type '. ../test_utils.sh' Enter
+Type 'new_temp_repo' Enter
+
+Type 'av stack branch stack-1' Enter
+Type 'create_commit "my-file" "1a" "Commit 1a"' Enter
+
+Type 'av stack branch stack-2' Enter
+Type 'create_commit "my-file" "2a" "Commit 2a"' Enter
+
+Type 'av stack branch stack-3' Enter
+Type 'create_commit "my-file" "3a" "Commit 3a"' Enter
+
+Type 'git switch stack-1' Enter
+Type 'clear' Enter
+Show
+
+Type 'av stack tree' Enter
+Sleep 2
+
+Type 'git commit --amend -m "Commit 1a (amended)"' Enter
+Sleep 2
+
+Type 'git --no-pager log --graph --all' Enter
+Sleep 2
+
+Type 'av stack restack' Enter
+Sleep 3
+
+Type 'git --no-pager log --graph --all' Enter
+Sleep 3

demos/test_utils.sh

@@ -1,7 +1,5 @@
 #!/bin/bash
 
-set -ex
-
 function new_temp_repo {
   cd "$(dirname -- "${BASH_SOURCE[0]}")"
   go build ../cmd/av