fix #1159

Author: AllenFang

src/BootstrapTable.js

@@ -23,7 +23,7 @@ class BootstrapTable extends Component {
       this.isIE = document.documentMode;
     }
     this.store = new TableDataStore(this.props.data ? this.props.data.slice() : []);
-
+    this.isVerticalScroll = false;
     this.initTable(this.props);
 
     if (this.props.selectRow && this.props.selectRow.selected) {
@@ -1152,7 +1152,7 @@ class BootstrapTable extends Component {
 
     const scrollBarWidth = isScroll ? Util.getScrollBarWidth() : 0;
     if (firstRow && this.store.getDataNum()) {
-      if (isScroll) {
+      if (isScroll || this.isVerticalScroll !== isScroll) {
         const cells = firstRow.childNodes;
         for (let i = 0; i < cells.length; i++) {
           const cell = cells[i];
@@ -1190,6 +1190,7 @@ class BootstrapTable extends Component {
         }
       });
     }
+    this.isVerticalScroll = isScroll;
   }
 
   _adjustHeight() {