Update youtrack-app.json with conditional 'showHeader' (SchemaStore#5374)

Co-authored-by: skoch13 <skoch13@users.noreply.github.com>

Author: andrey-skl

src/negative_test/youtrack-app/showHeader-not-allowed-extension-point.json

@@ -0,0 +1,12 @@
+{
+  "name": "showheader-not-allowed-extension-point",
+  "widgets": [
+    {
+      "extensionPoint": "ISSUE_BELOW_SUMMARY",
+      "indexPath": "index.html",
+      "key": "issue-widget",
+      "name": "Issue Widget",
+      "showHeader": true
+    }
+  ]
+}

src/schemas/json/youtrack-app.json

@@ -241,6 +241,10 @@
             "uniqueItems": true,
             "description": "The set of permissions required to view and use the widget. Depending on the app scope, these permissions can be required at the global or project level.",
             "items": { "$ref": "#/definitions/permissions" }
+          },
+          "showHeader": {
+            "type": "boolean",
+            "description": "Controls the global top bar for full screen widgets. If set to false, the app must implement a visually consistent custom header or breadcrumbs."
           }
         },
         "allOf": [
@@ -326,6 +330,33 @@
                 }
               }
             }
+          },
+          {
+            "if": {
+              "not": {
+                "anyOf": [
+                  {
+                    "properties": {
+                      "extensionPoint": { "const": "MAIN_MENU_ITEM" }
+                    },
+                    "required": ["extensionPoint"]
+                  },
+                  {
+                    "properties": {
+                      "extensionPoint": { "const": "ADMINISTRATION_MENU_ITEM" }
+                    },
+                    "required": ["extensionPoint"]
+                  }
+                ]
+              }
+            },
+            "then": {
+              "properties": {
+                "showHeader": {
+                  "not": {}
+                }
+              }
+            }
           }
         ],
         "required": ["key", "name", "indexPath", "extensionPoint"]

src/test/youtrack-app/showHeader-administration-menu-item.json

@@ -0,0 +1,12 @@
+{
+  "name": "showheader-administration-menu-item",
+  "widgets": [
+    {
+      "extensionPoint": "ADMINISTRATION_MENU_ITEM",
+      "indexPath": "index.html",
+      "key": "admin-menu-widget",
+      "name": "Admin Menu Widget",
+      "showHeader": false
+    }
+  ]
+}

src/test/youtrack-app/showHeader-main-menu-item.json

@@ -0,0 +1,12 @@
+{
+  "name": "showheader-main-menu-item",
+  "widgets": [
+    {
+      "extensionPoint": "MAIN_MENU_ITEM",
+      "indexPath": "index.html",
+      "key": "main-menu-widget",
+      "name": "Main Menu Widget",
+      "showHeader": true
+    }
+  ]
+}