BI-47571 refactor: 下拉多层树增加最小高度

src/widget/multilayerselecttree/multilayerselecttree.combo.js

@@ -85,7 +85,8 @@ BI.MultiLayerSelectTreeCombo = BI.inherit(BI.Widget, {
                     }]
                 },
                 value: o.value,
-                maxHeight: 400
+                maxHeight: 400,
+                minHeight: 240
             }
         };
     },

src/widget/multilayersingletree/multilayersingletree.combo.js

@@ -88,7 +88,8 @@ BI.MultiLayerSingleTreeCombo = BI.inherit(BI.Widget, {
                     }]
                 },
                 value: o.value,
-                maxHeight: 400
+                maxHeight: 400,
+                minHeight: 240
             }
         };
     },