bug: fix always renderers initial position

packages/dockview-core/src/__tests__/dockview/dockviewComponent.spec.ts

@@ -1363,6 +1363,104 @@ describe('dockviewComponent', () => {
 
             expect(state).toEqual(api.toJSON());
         });
+
+        test('always visible renderer positioning after fromJSON', async () => {
+            dockview.layout(1000, 1000);
+
+            // Create a layout with both onlyWhenVisible and always visible panels
+            dockview.fromJSON({
+                activeGroup: 'group-1',
+                grid: {
+                    root: {
+                        type: 'branch',
+                        data: [
+                            {
+                                type: 'leaf',
+                                data: {
+                                    views: ['panel1', 'panel2'],
+                                    id: 'group-1',
+                                    activeView: 'panel1',
+                                },
+                                size: 500,
+                            },
+                            {
+                                type: 'leaf',
+                                data: {
+                                    views: ['panel3'],
+                                    id: 'group-2',
+                                    activeView: 'panel3',
+                                },
+                                size: 500,
+                            },
+                        ],
+                        size: 1000,
+                    },
+                    height: 1000,
+                    width: 1000,
+                    orientation: Orientation.HORIZONTAL,
+                },
+                panels: {
+                    panel1: {
+                        id: 'panel1',
+                        contentComponent: 'default',
+                        title: 'panel1',
+                        renderer: 'onlyWhenVisible',
+                    },
+                    panel2: {
+                        id: 'panel2',
+                        contentComponent: 'default',
+                        title: 'panel2',
+                        renderer: 'always',
+                    },
+                    panel3: {
+                        id: 'panel3',
+                        contentComponent: 'default',
+                        title: 'panel3',
+                        renderer: 'always',
+                    },
+                },
+            });
+
+            // Wait for next animation frame to ensure positioning is complete
+            await new Promise((resolve) => requestAnimationFrame(resolve));
+
+            const panel2 = dockview.getGroupPanel('panel2')!;
+            const panel3 = dockview.getGroupPanel('panel3')!;
+
+            // Verify that always visible panels have been positioned
+            const overlayContainer = dockview.overlayRenderContainer;
+
+            // Check that panels with renderer: 'always' are attached to overlay container
+            expect(panel2.api.renderer).toBe('always');
+            expect(panel3.api.renderer).toBe('always');
+
+            // Get the overlay elements for always visible panels
+            const panel2Overlay = overlayContainer.element.querySelector('[data-panel-id]') as HTMLElement;
+            const panel3Overlay = overlayContainer.element.querySelector('[data-panel-id]:not(:first-child)') as HTMLElement;
+
+            // Verify positioning has been applied (should not be 0 after layout)
+            if (panel2Overlay) {
+                const style = getComputedStyle(panel2Overlay);
+                expect(style.position).toBe('absolute');
+                expect(style.left).not.toBe('0px');
+                expect(style.top).not.toBe('0px');
+                expect(style.width).not.toBe('0px');
+                expect(style.height).not.toBe('0px');
+            }
+
+            // Test that updateAllPositions method works correctly
+            const updateSpy = jest.spyOn(overlayContainer, 'updateAllPositions');
+
+            // Call fromJSON again to trigger position updates
+            dockview.fromJSON(dockview.toJSON());
+
+            // Wait for the position update to be called
+            await new Promise((resolve) => requestAnimationFrame(resolve));
+
+            expect(updateSpy).toHaveBeenCalled();
+
+            updateSpy.mockRestore();
+        });
     });
 
     test('add panel', () => {

packages/dockview-core/src/__tests__/overlay/overlayRenderContainer.spec.ts

@@ -347,4 +347,111 @@ describe('overlayRenderContainer', () => {
         expect(referenceContainer.element.getBoundingClientRect).toHaveBeenCalledTimes(2);
         expect(parentContainer.getBoundingClientRect).toHaveBeenCalledTimes(2);
     });
+
+    test('updateAllPositions forces position recalculation for visible panels', async () => {
+        const cut = new OverlayRenderContainer(
+            parentContainer,
+            fromPartial<DockviewComponent>({})
+        );
+
+        const panelContentEl1 = document.createElement('div');
+        const panelContentEl2 = document.createElement('div');
+
+        const onDidVisibilityChange1 = new Emitter<any>();
+        const onDidDimensionsChange1 = new Emitter<any>();
+        const onDidLocationChange1 = new Emitter<any>();
+
+        const onDidVisibilityChange2 = new Emitter<any>();
+        const onDidDimensionsChange2 = new Emitter<any>();
+        const onDidLocationChange2 = new Emitter<any>();
+
+        const panel1 = fromPartial<IDockviewPanel>({
+            api: {
+                id: 'panel1',
+                onDidVisibilityChange: onDidVisibilityChange1.event,
+                onDidDimensionsChange: onDidDimensionsChange1.event,
+                onDidLocationChange: onDidLocationChange1.event,
+                isVisible: true,
+                location: { type: 'grid' },
+            },
+            view: {
+                content: {
+                    element: panelContentEl1,
+                },
+            },
+            group: {
+                api: {
+                    location: { type: 'grid' },
+                },
+            },
+        });
+
+        const panel2 = fromPartial<IDockviewPanel>({
+            api: {
+                id: 'panel2',
+                onDidVisibilityChange: onDidVisibilityChange2.event,
+                onDidDimensionsChange: onDidDimensionsChange2.event,
+                onDidLocationChange: onDidLocationChange2.event,
+                isVisible: false, // This panel is not visible
+                location: { type: 'grid' },
+            },
+            view: {
+                content: {
+                    element: panelContentEl2,
+                },
+            },
+            group: {
+                api: {
+                    location: { type: 'grid' },
+                },
+            },
+        });
+
+        // Mock getBoundingClientRect for consistent testing
+        jest.spyOn(referenceContainer.element, 'getBoundingClientRect')
+            .mockReturnValue(
+                fromPartial<DOMRect>({
+                    left: 100,
+                    top: 200,
+                    width: 150,
+                    height: 250,
+                })
+            );
+
+        jest.spyOn(parentContainer, 'getBoundingClientRect').mockReturnValue(
+            fromPartial<DOMRect>({
+                left: 50,
+                top: 100,
+                width: 200,
+                height: 300,
+            })
+        );
+
+        // Attach both panels
+        const container1 = cut.attach({ panel: panel1, referenceContainer });
+        const container2 = cut.attach({ panel: panel2, referenceContainer });
+
+        await exhaustMicrotaskQueue();
+        await exhaustAnimationFrame();
+
+        // Clear previous calls to getBoundingClientRect
+        jest.clearAllMocks();
+
+        // Call updateAllPositions
+        cut.updateAllPositions();
+
+        // Should trigger resize for visible panels only
+        await exhaustAnimationFrame();
+
+        // Verify that positioning was updated for visible panel
+        expect(container1.style.left).toBe('50px');
+        expect(container1.style.top).toBe('100px');
+        expect(container1.style.width).toBe('150px');
+        expect(container1.style.height).toBe('250px');
+
+        // Verify getBoundingClientRect was called for visible panel only
+        // updateAllPositions should call the resize function which triggers getBoundingClientRect
+        expect(referenceContainer.element.getBoundingClientRect).toHaveBeenCalled();
+        expect(parentContainer.getBoundingClientRect).toHaveBeenCalled();
+    });
 });

packages/dockview-core/src/dockview/dockviewComponent.ts

@@ -1621,6 +1621,11 @@ export class DockviewComponent
 
         this.updateWatermark();
 
+        // Force position updates for always visible panels after DOM layout is complete
+        requestAnimationFrame(() => {
+            this.overlayRenderContainer.updateAllPositions();
+        });
+
         this._onDidLayoutFromJSON.fire();
     }
 

packages/dockview-core/src/overlay/overlayRenderContainer.ts

@@ -61,6 +61,7 @@ export class OverlayRenderContainer extends CompositeDisposable {
             disposable: IDisposable;
             destroy: IDisposable;
             element: HTMLElement;
+            resize?: () => void;
         }
     > = {};
 
@@ -85,6 +86,22 @@ export class OverlayRenderContainer extends CompositeDisposable {
         );
     }
 
+    updateAllPositions(): void {
+        if (this._disposed) {
+            return;
+        }
+
+        // Invalidate position cache to force recalculation
+        this.positionCache.invalidate();
+
+        // Call resize function directly for all visible panels
+        for (const entry of Object.values(this.map)) {
+            if (entry.panel.api.isVisible && entry.resize) {
+                entry.resize();
+            }
+        }
+    }
+
     detatch(panel: IDockviewPanel): boolean {
         if (this.map[panel.api.id]) {
             const { disposable, destroy } = this.map[panel.api.id];
@@ -290,6 +307,8 @@ export class OverlayRenderContainer extends CompositeDisposable {
         this.map[panel.api.id].disposable.dispose();
         // and reset the disposable to the active reference-container
         this.map[panel.api.id].disposable = disposable;
+        // store the resize function for direct access
+        this.map[panel.api.id].resize = resize;
 
         return focusContainer;
     }