REPORT-55672 悬浮元素-新建模板第一次添加的悬浮元素不能移动位置

【问题原因】
resizingBackupBounds仅在拖拽改变尺寸，光标改变时初始化，所以导致拖拽移动时，出现NPE
【改动思路】
resizingBackupBounds只在等比例尺寸缩放拖拽改变尺寸时需要

designer-realize/src/main/java/com/fr/grid/GridMouseAdapter.java

@@ -408,11 +408,11 @@ public class GridMouseAdapter implements MouseListener, MouseWheelListener, Mous
         int currentWidth = currentRight - currentLeft;
         int currentHeight = currentBottom - currentTop;
 
-        int backupWidth= resizingBackupBounds[2];
-        int backupHeight= resizingBackupBounds[3];
-
         if (cursorType == Cursor.NW_RESIZE_CURSOR || cursorType == Cursor.NE_RESIZE_CURSOR || cursorType == Cursor.SE_RESIZE_CURSOR || cursorType == Cursor.SW_RESIZE_CURSOR) {
-            if (aspectRatio) {
+            if (aspectRatio && resizingBackupBounds != null) {
+                int backupWidth= resizingBackupBounds[2];
+                int backupHeight= resizingBackupBounds[3];
+
                 double currentDiagonal = Math.pow(currentWidth, 2) + Math.pow(currentHeight, 2);
                 double backupDiagonal = Math.pow(backupWidth, 2) + Math.pow(backupHeight, 2);
 
@@ -452,7 +452,10 @@ public class GridMouseAdapter implements MouseListener, MouseWheelListener, Mous
             floatElement.setTopDistance(topDistance);
             floatElement.setHeight(FU.valueOfPix(currentBottom, resolution).subtract(floatY1_fu));
 
-            if (aspectRatio) {
+            if (aspectRatio && resizingBackupBounds != null) {
+                int backupWidth= resizingBackupBounds[2];
+                int backupHeight= resizingBackupBounds[3];
+
                 currentWidth = backupWidth * currentHeight / backupHeight;
                 currentRight = currentLeft + currentWidth;
                 FU floatX1_fu = FU.valueOfPix(currentLeft, resolution);
@@ -465,7 +468,10 @@ public class GridMouseAdapter implements MouseListener, MouseWheelListener, Mous
             floatElement.setLeftDistance(leftDistance);
             floatElement.setWidth(FU.valueOfPix(currentRight, resolution).subtract(floatX1_fu));
 
-            if (aspectRatio) {
+            if (aspectRatio && resizingBackupBounds != null) {
+                int backupWidth= resizingBackupBounds[2];
+                int backupHeight= resizingBackupBounds[3];
+
                 currentHeight = backupHeight * currentWidth / backupWidth;
                 currentBottom = currentTop + currentHeight;
                 FU floatY1_fu = FU.valueOfPix(currentTop, resolution);