fix: adjust run: when_changed to work correctly with imported tasks (#2511)

testdata/run_when_changed/Taskfile.yml

@@ -0,0 +1,11 @@
+version: '3'
+
+includes:
+  service-a: ./service-a
+  service-b: ./service-b
+
+tasks:
+  start:
+    cmds:
+      - task: service-a:start
+      - task: service-b:start

testdata/run_when_changed/library/Taskfile.yml

@@ -0,0 +1,7 @@
+version: '3'
+
+tasks:
+  login:
+    run: when_changed
+    cmds:
+      - echo "login server={{.SERVER}} user={{.USER}}"

testdata/run_when_changed/service-a/Taskfile.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+includes:
+  library:
+    taskfile: ../library/Taskfile.yml
+    dir: ../library
+
+tasks:
+  start:
+    cmds:
+      - task: library:login
+        vars:
+          SERVER: fubar
+          USER: fubar
+      - task: library:login
+        vars:
+          SERVER: foo
+          USER: foo

testdata/run_when_changed/service-b/Taskfile.yml

@@ -0,0 +1,18 @@
+version: '3'
+
+includes:
+  library:
+    taskfile: ../library/Taskfile.yml
+    dir: ../library
+
+tasks:
+  start:
+    cmds:
+      - task: library:login
+        vars:
+          SERVER: fubar
+          USER: fubar
+      - task: library:login
+        vars:
+          SERVER: bar
+          USER: bar