BI-119128 fix: 【自适应迭代发散】小屏编辑，高度适应+自定义（1366*449），直接预览，文本控件下拉选项偏离

上下空间都不够的时候场景。
另外高度自适应fixed元素导致滚动问题还需探索一下

src/core/platform/web/dom.js

@@ -416,27 +416,28 @@
             };
         },
 
-        getBottomAdaptPosition: function (combo, popup, extraHeight, needAdaptHeight) {
+        getBottomAdaptPosition: function (combo, popup, extraHeight, needAdaptHeight, positionRelativeElement) {
             var comboBounds = combo.element[0].getBoundingClientRect(),
                 popupBounds = popup.element[0].getBoundingClientRect(),
-                windowBounds = BI.Widget._renderEngine.createElement("body").bounds();
+                viewportBounds = document.documentElement.getBoundingClientRect(),
+                positionRelativeElementRect = positionRelativeElement.getBoundingClientRect();
             if (BI.DOM.isBottomSpaceEnough(combo, popup, extraHeight)) {
-                return BI.DOM.getBottomPosition(combo, popup, extraHeight);
+                return BI.DOM.getBottomPosition(combo, popup, extraHeight, positionRelativeElement);
             }
             if (needAdaptHeight) {
                 return {
-                    top: comboBounds.top + comboBounds.height + extraHeight,
-                    adaptHeight: windowBounds.height - comboBounds.top - comboBounds.height - extraHeight
+                    top: comboBounds.top + comboBounds.height + extraHeight - positionRelativeElementRect.top,
+                    adaptHeight: viewportBounds.height - comboBounds.top - comboBounds.height - extraHeight
                 };
             }
-            if (popupBounds.height + extraHeight > windowBounds.height) {
+            if (popupBounds.height + extraHeight > viewportBounds.height) {
                 return {
-                    top: extraHeight,
-                    adaptHeight: windowBounds.height - extraHeight
+                    top: extraHeight - positionRelativeElementRect.top,
+                    adaptHeight: viewportBounds.height - extraHeight
                 };
             }
             return {
-                top: windowBounds.height - popupBounds.height - extraHeight
+                top: viewportBounds.height - popupBounds.height - extraHeight - positionRelativeElementRect.top
             };
         },