:art: fix https://github.com/siyuan-note/siyuan/issues/6890

app/src/asset/renderAssets.ts

@@ -32,6 +32,12 @@ export const pdfResize = () => {
         if (!pdfDocument) {
             return;
         }
+        const pdfViewerElement = item.element.querySelector("#viewerContainer")
+        if (pdfViewerElement) {
+            // https://github.com/siyuan-note/siyuan/issues/6890
+            pdfViewerElement.scrollTo(0, parseInt(pdfViewerElement.getAttribute("data-scrolltop")));
+            pdfViewerElement.removeAttribute("data-scrolltop")
+        }
         const currentScaleValue = pdfViewer.currentScaleValue;
         if (
             currentScaleValue === "auto" ||

app/src/layout/Wnd.ts

@@ -280,6 +280,13 @@ export class Wnd {
             const targetWnd = getInstanceById(targetWndElement.getAttribute("data-id")) as Wnd;
             const tabId = event.dataTransfer.getData(Constants.SIYUAN_DROP_TAB);
             const oldTab = getInstanceById(tabId) as Tab;
+            if (oldTab.model instanceof  Asset) {
+                // https://github.com/siyuan-note/siyuan/issues/6890
+                const pdfViewerElement = oldTab.model.element.querySelector("#viewerContainer")
+                if (pdfViewerElement) {
+                    pdfViewerElement.setAttribute("data-scrolltop", pdfViewerElement.scrollTop.toString())
+                }
+            }
             if (dragElement.style.height === "50%" || dragElement.style.width === "50%") {
                 // split
                 if (dragElement.style.height === "50%") {