feat(tracker): Gantt — #3a editable viewlet (drag, resize, dnd)

models/tracker/src/index.ts

@@ -196,7 +196,9 @@ function defineFilters (builder: Builder): void {
         key: 'milestone',
         component: view.component.ObjectFilter,
         showNested: false
-      }
+      },
+      'startDate',
+      'dueDate'
     ],
     ignoreKeys: ['number', 'estimation', 'attachedTo'],
     getVisibleFilters: tracker.function.GetVisibleFilters

models/tracker/src/viewlets.ts

@@ -212,6 +212,75 @@ export function issueConfig (
   ]
 }
 
+export function ganttViewOptions (): ViewOptionsModel {
+  // PR 2 ships a minimal read-only Gantt. Group-by + Show-colors are
+  // intentionally NOT advertised — the canvas does not honour them yet.
+  // The two sidebar-column toggles below ARE wired up to GanttSidebar.
+  return {
+    groupBy: [],
+    orderBy: [
+      ['startDate', SortingOrder.Ascending],
+      ['rank', SortingOrder.Ascending],
+      ['dueDate', SortingOrder.Ascending]
+    ],
+    other: [
+      {
+        key: 'ganttShowIssueCode',
+        type: 'toggle',
+        defaultValue: false,
+        actionTarget: 'display',
+        label: tracker.string.GanttShowIssueCode
+      },
+      {
+        key: 'ganttShowTitle',
+        type: 'toggle',
+        defaultValue: true,
+        actionTarget: 'display',
+        label: tracker.string.GanttShowTitle
+      },
+      {
+        key: 'ganttShowStatus',
+        type: 'toggle',
+        defaultValue: true,
+        actionTarget: 'display',
+        label: tracker.string.GanttShowStatus
+      },
+      {
+        // Default-on safety prompt: when set, dragging an issue's bar to a
+        // new date range shows a confirm dialog before writing the change.
+        // User feedback 2026-05-11: easy to misclick a bar while panning,
+        // and a one-click confirm prevents accidental schedule edits.
+        key: 'ganttConfirmMove',
+        type: 'toggle',
+        defaultValue: true,
+        actionTarget: 'display',
+        label: tracker.string.GanttConfirmMove
+      },
+      {
+        // Same idea but for left/right resize handles.
+        key: 'ganttConfirmResize',
+        type: 'toggle',
+        defaultValue: true,
+        actionTarget: 'display',
+        label: tracker.string.GanttConfirmResize
+      }
+    ]
+  }
+}
+
+export function ganttConfig (): BuildModelKey[] {
+  // Minimal config — Gantt drives its own column layout.
+  return [
+    {
+      key: '',
+      presenter: tracker.component.PriorityEditor,
+      label: tracker.string.Priority,
+      props: { kind: 'list', size: 'small' }
+    },
+    { key: '', presenter: tracker.component.IssuePresenter, label: tracker.string.Issue }
+  ]
+}
+
 export function defineViewlets (builder: Builder): void {
   builder.createDoc(
     view.class.ViewletDescriptor,
@@ -224,6 +293,17 @@ export function defineViewlets (builder: Builder): void {
     tracker.viewlet.Kanban
   )
 
+  builder.createDoc(
+    view.class.ViewletDescriptor,
+    core.space.Model,
+    {
+      label: tracker.string.Gantt,
+      icon: tracker.icon.Gantt,
+      component: tracker.component.GanttView
+    },
+    tracker.viewlet.Gantt
+  )
+
   builder.createDoc(
     view.class.Viewlet,
     core.space.Model,
@@ -501,6 +581,23 @@ export function defineViewlets (builder: Builder): void {
     tracker.viewlet.IssueKanban
   )
 
+  // Gantt is registered AFTER List + Kanban so List remains the default
+  // viewlet (ViewletSelector falls back to viewlets[0] when no preference
+  // is saved). Putting Gantt last avoids surprising users with an empty
+  // canvas on first visit.
+  builder.createDoc(
+    view.class.Viewlet,
+    core.space.Model,
+    {
+      attachTo: tracker.class.Issue,
+      descriptor: tracker.viewlet.Gantt,
+      viewOptions: ganttViewOptions(),
+      configOptions: { strict: true, hiddenKeys: ['title'] },
+      config: ganttConfig()
+    },
+    tracker.viewlet.IssueGantt
+  )
+
   const componentListViewOptions: ViewOptionsModel = {
     groupBy: ['lead', 'createdBy', 'modifiedBy'],
     orderBy: [

plugins/tracker-assets/lang/cs.json

@@ -283,7 +283,26 @@
     "UnsetParentIssue": "Odebrat nadřazený úkol",
     "ForbidCreateProjectPermission": "Zakázat vytvoření projektu",
     "ForbidCreateProjectPermissionDescription": "Zakazuje uživatelům vytvářet nové projekty",
-    "AllowCreatingIssues": "Povolit vytváření úkolů"
+    "AllowCreatingIssues": "Povolit vytváření úkolů",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/de.json

@@ -293,7 +293,26 @@
     "UnsetParentIssue": "Übergeordnete Aufgabe entfernen",
     "ForbidCreateProjectPermission": "Projekterstellung verbieten",
     "ForbidCreateProjectPermissionDescription": "Verbietet Benutzern das Erstellen neuer Projekte",
-    "AllowCreatingIssues": "Erstellen von Aufgaben erlauben"
+    "AllowCreatingIssues": "Erstellen von Aufgaben erlauben",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/en.json

@@ -293,7 +293,45 @@
     "UnsetParentIssue": "Unset parent issue",
     "ForbidCreateProjectPermission": "Forbid create project",
     "ForbidCreateProjectPermissionDescription": "Forbid users creating new projects",
-    "AllowCreatingIssues": "Allow creating issues"
+    "AllowCreatingIssues": "Allow creating issues",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse",
+    "GanttDragConflict": "Issue was changed by someone else, please retry",
+    "GanttDragFailed": "Failed to apply Gantt edit",
+    "GanttDragNoPermission": "You don't have permission to edit this issue",
+    "GanttDragValidation": "Date is not valid: {reason}",
+    "GanttResizingTooltip": "{from} days → {to} days ({delta} d)",
+    "SetStartDate": "Set start date…",
+    "Hierarchy": "Hierarchy",
+    "LinkExistingSubIssue": "Link existing as sub-issue…",
+    "SetParentIssueLabel": "Set parent issue…",
+    "GanttDragToSchedule": "Drag to schedule",
+    "GanttDurationTooltip": "Duration: {days} d",
+    "GanttConfirmMove": "Confirm before moving an issue",
+    "GanttConfirmResize": "Confirm before resizing an issue",
+    "GanttConfirmMoveTitle": "Move issue?",
+    "GanttConfirmResizeTitle": "Change issue dates?",
+    "GanttConfirmMoveBody": "Move {title} to {start} – {due}?",
+    "GanttConfirmResizeBody": "Change {title} to {start} – {due}?",
+    "GanttConfirmApply": "Apply",
+    "GanttAriaResizeStart": "Resize start date",
+    "GanttAriaResizeEnd": "Resize due date"
   },
   "status": {}
 }

plugins/tracker-assets/lang/es.json

@@ -276,7 +276,26 @@
     "UnsetParentIssue": "Unset parent issue",
     "ForbidCreateProjectPermission": "Prohibir crear proyecto",
     "ForbidCreateProjectPermissionDescription": "Prohíbe a los usuarios crear nuevos proyectos",
-    "AllowCreatingIssues": "Permitir crear incidencias"
+    "AllowCreatingIssues": "Permitir crear incidencias",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/fr.json

@@ -276,7 +276,26 @@
     "UnsetParentIssue": "Désélectionner l'issue parent",
     "ForbidCreateProjectPermission": "Interdire la création de projet",
     "ForbidCreateProjectPermissionDescription": "Interdit aux utilisateurs de créer de nouveaux projets",
-    "AllowCreatingIssues": "Autoriser la création d'issues"
+    "AllowCreatingIssues": "Autoriser la création d'issues",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/it.json

@@ -276,7 +276,26 @@
     "UnsetParentIssue": "Annulla l'issue genitore",
     "ForbidCreateProjectPermission": "Vieta creazione progetto",
     "ForbidCreateProjectPermissionDescription": "Vieta agli utenti di creare nuovi progetti",
-    "AllowCreatingIssues": "Consenti la creazione di issue"
+    "AllowCreatingIssues": "Consenti la creazione di issue",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/ja.json

@@ -276,7 +276,26 @@
     "UnsetParentIssue": "親イシューの設定を解除",
     "ForbidCreateProjectPermission": "プロジェクト作成禁止",
     "ForbidCreateProjectPermissionDescription": "ユーザーが新しいプロジェクトを作成することを禁止します",
-    "AllowCreatingIssues": "イシューの作成を許可"
+    "AllowCreatingIssues": "イシューの作成を許可",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }

plugins/tracker-assets/lang/ko.json

@@ -276,7 +276,25 @@
         "UnsetParentIssue": "상위 이슈 설정 해제",
         "ForbidCreateProjectPermission": "프로젝트 생성 금지",
         "ForbidCreateProjectPermissionDescription": "사용자의 새 프로젝트 생성을 금지",
-        "AllowCreatingIssues": "이슈 생성 허용"
+        "AllowCreatingIssues": "이슈 생성 허용",
+        "Day": "Day",
+        "Week": "Week",
+        "Month": "Month",
+        "Quarter": "Quarter",
+        "Gantt": "Gantt",
+        "GanttShowIssueCode": "Show issue code",
+        "GanttShowTitle": "Show title",
+        "GanttShowStatus": "Show status",
+        "GanttToday": "Today",
+        "GanttJumpToStart": "Jump to start",
+        "GanttJumpToEnd": "Jump to end",
+        "GanttJumpToDate": "Jump to date",
+        "GanttPreviousPeriod": "Previous period",
+        "GanttNextPeriod": "Next period",
+        "GanttScrollLeftToBar": "Scroll left to bar",
+        "GanttScrollRightToBar": "Scroll right to bar",
+        "GanttExpand": "Expand",
+        "GanttCollapse": "Collapse"
     },
     "status": {}
 }

plugins/tracker-assets/lang/pt-br.json

@@ -276,7 +276,26 @@
     "UnsetParentIssue": "Desmarcar problema pai",
     "ForbidCreateProjectPermission": "Proibir criação de projeto",
     "ForbidCreateProjectPermissionDescription": "Proíbe os usuários de criar novos projetos",
-    "AllowCreatingIssues": "Permitir criar problemas"
+    "AllowCreatingIssues": "Permitir criar problemas",
+    "Day": "Day",
+    "Week": "Week",
+    "Month": "Month",
+    "Quarter": "Quarter",
+    "Gantt": "Gantt",
+    "GanttShowIssueCode": "Show issue code",
+    "GanttShowTitle": "Show title",
+    "GanttShowStatus": "Show status",
+    "GanttToday": "Today",
+    "GanttJumpToStart": "Jump to start",
+    "GanttJumpToEnd": "Jump to end",
+    "GanttJumpToDate": "Jump to date",
+    "GanttPreviousPeriod": "Previous period",
+    "GanttNextPeriod": "Next period",
+    "GanttScrollLeftToBar": "Scroll left to bar",
+    "GanttScrollRightToBar": "Scroll right to bar",
+    "GanttExpand": "Expand",
+    "GanttCollapse": "Collapse"
+
   },
   "status": {}
 }