What-If Tool: Fix error message overflow issue (#2462)

Long WIT error messages caused text overflow, hiding some controls.

Author: jameswex

tensorboard/plugins/interactive_inference/tf_interactive_inference_dashboard/tf-interactive-inference-dashboard.html

@@ -165,6 +165,10 @@
         margin-top: 4px;
       }
 
+      .datapoint-right-controls-holder .control {
+        flex-shrink: 0;
+      }
+
       .button {
         font-size: 13px;
         margin: 10px 0 0 0;
@@ -404,6 +408,7 @@
       .datapoint-right-controls-holder {
         display: flex;
         flex-direction: row-reverse;
+        overflow: hidden;
       }
 
       .tf-category-pane {
@@ -740,7 +745,8 @@
         color: #5F6368;
         white-space: nowrap;
         overflow: hidden;
-        padding-top: 16px;
+        text-overflow: ellipsis;
+        padding-top: 20px;
       }
 
       .example-id-label {
@@ -1307,10 +1313,10 @@ <h2>Show similarity to selected datapoint</h2>
                   </paper-tabs>
                 </div>
                 <div class="datapoint-right-controls-holder">
-                  <a target="_blank" href="https://github.com/tensorflow/tensorboard/tree/master/tensorboard/plugins/interactive_inference/README.md">
+                  <a target="_blank" class="control" href="https://github.com/tensorflow/tensorboard/tree/master/tensorboard/plugins/interactive_inference/README.md">
                     <paper-icon-button icon="help-outline" class="settings-button" title="What-If Tool documentation"></paper-icon-button>
                   </a>
-                  <paper-icon-button icon="settings" on-tap="settingsClicked_" class="settings-button" title="What-If Tool settings" disabled$="[[local]]"></paper-icon-button>
+                  <paper-icon-button icon="settings" on-tap="settingsClicked_" class="settings-button control" title="What-If Tool settings" disabled$="[[local]]"></paper-icon-button>
                   <div class="example-status">[[exampleStatusStr]]</div>
                 </div>
               </div>