Print Preview Advanced settings tweaks:

chrome/browser/resources/print_preview/settings/advanced_settings/advanced_settings_item.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Component that renders a destination item in a destination list.
    * @param {!cr.EventTarget} eventTarget Event target to dispatch selection
@@ skipping 131 matching lines @@
         return this.select_.value == option.value || option.is_default;
       }.bind(this));
     },
 
     /**
      * Called when the text element value is changed.
      * @private
      */
     onTextInput_: function() {
       this.selectedValue_ = this.text_.value || null;
+
+      if (this.query_) {
+        var optionMatches = (this.selectedValue_ || '').match(this.query_);
+        // Even if there's no match anymore, keep the item visible to do not
+        // surprise user.
+        if (optionMatches)
+          this.showSearchBubble_(optionMatches[0]);
+        else
+          this.hideSearchBubble_();
+      }
     },
 
     /**
      * Renders capability properties according to the current state.
      * @private
      */
     renderCapability_: function() {
       var textContent = this.capability_.display_name;
       var nameMatches = this.query_ ? !!textContent.match(this.query_) : true;
       var optionMatches = null;
       if (this.query_) {
         if (this.capability_.type == 'SELECT') {
           this.capability_.select_cap.option.some(function(option) {
             optionMatches = (option.display_name || '').match(this.query_);
             return !!optionMatches;
           }.bind(this));
         } else {
           optionMatches = (this.text_.value || '').match(this.query_);
         }
       }
       var matches = nameMatches || optionMatches;
 
-      if ((!matches || !optionMatches) && this.searchBubble_) {
-        this.searchBubble_.dispose();
-        this.searchBubble_ = null;
-      }
+      if (!matches || !optionMatches)
+        this.hideSearchBubble_();
 
       setIsVisible(this.getElement(), matches);
       if (!matches)
         return;
 
       var nameEl = this.getChildElement('.advanced-settings-item-label');
       if (this.query_) {
         nameEl.textContent = '';
         this.addTextWithHighlight_(nameEl, textContent);
       } else {
         nameEl.textContent = textContent;
       }
       nameEl.title = textContent;
 
-      if (optionMatches) {
-        var element =
-            this.capability_.type == 'SELECT' ? this.select_ : this.text_;
-        if (!this.searchBubble_) {
-          this.searchBubble_ = new print_preview.SearchBubble(optionMatches[0]);
-          this.searchBubble_.attachTo(element);
-        } else {
-          this.searchBubble_.content = optionMatches[0];
-        }
+      if (optionMatches)
+        this.showSearchBubble_(optionMatches[0]);
+    },
+
+    /**
+     * Shows search bubble for this element.
+     * @param {string} text Text to show in the search bubble.
+     * @private
+     */
+    showSearchBubble_: function(text) {
+      var element =
+          this.capability_.type == 'SELECT' ? this.select_ : this.text_;
+      if (!this.searchBubble_) {
+        this.searchBubble_ = new print_preview.SearchBubble(text);
+        this.searchBubble_.attachTo(element);
+      } else {
+        this.searchBubble_.content = text;
       }
     },
 
+    /**
+     * Hides search bubble associated with this element.
+     * @private
+     */
+    hideSearchBubble_: function() {
+      if (this.searchBubble_) {
+        this.searchBubble_.dispose();
+        this.searchBubble_ = null;
+      }
+    },
+
     /**
      * Initializes the element's value control.
      * @private
      */
     initializeValue_: function() {
       this.selectedValue_ =
           this.printTicketStore_.vendorItems.ticketItems[this.id] || null;
 
       if (this.capability_.type == 'SELECT')
         this.initializeSelectValue_();
@@ skipping 56 matching lines @@
         }
       });
     }
   };
 
   // Export
   return {
     AdvancedSettingsItem: AdvancedSettingsItem
   };
 });