[add] minor docs updates and what's new for v9.2.3

Author: mafanya23

docs/grid/api/gridcolumn_properties/gridcolumn_header_property.md

@@ -37,7 +37,7 @@ header: [
             multiselection?: boolean,
             readonly?: boolean,
             placeholder?: string,
-            virtual?: boolean,
+            virtual?: boolean, // true by default
             template?: function
         },
         customFilter?: (item, input: string) => boolean,
@@ -79,7 +79,7 @@ Each header object may include:
             <td><a href="../../../configuration/#headerfooter-filters"><b>content</b></a></td><td>(optional) additional content of a header, which can be one of the filters: "inputFilter" | "selectFilter" | "comboFilter"</td>
         </tr>
         <tr>
-            <td><a href="../../../configuration/#headerfooter-filters"><b>filterConfig</b></a></td><td>(optional) a configuration object for <b>"comboFilter"</b>. It can contain a set of properties:<ul><li><b>filter</b> - (optional) sets a custom function for filtering Combo Box options</li><li><b>multiselection</b> - (optional) enables selection of multiple options</li><li><b>readonly</b> - (optional) makes ComboBox readonly (it is only possible to select options from the list, without entering words in the input). The default value of the <b>readonly</b> property depends on the following conditions:<ul><li>the `readonly:true` is set as a default value, if `htmlEnable:true` is set for a column and there is no template specified for a column</li><li>in all other cases, `readonly:false` is set by default</li></ul></li><li><b>placeholder</b> - (optional) sets a placeholder in the input of ComboBox</li><li><b>virtual</b> - (optional) enables dynamic loading of data on scrolling the list of options</li><li><b>template</b> - (optional) a function which returns a template with content for the filter options. Takes an option item as a parameter:<ul><li><b>item</b> - (object) an option item</li></ul></li></ul></td>
+            <td><a href="../../../configuration/#headerfooter-filters"><b>filterConfig</b></a></td><td>(optional) a configuration object for <b>"comboFilter"</b>. It can contain a set of properties:<ul><li><b>filter</b> - (optional) sets a custom function for filtering Combo Box options</li><li><b>multiselection</b> - (optional) enables selection of multiple options</li><li><b>readonly</b> - (optional) makes ComboBox readonly (it is only possible to select options from the list, without entering words in the input). The default value of the <b>readonly</b> property depends on the following conditions:<ul><li>the `readonly:true` is set as a default value, if `htmlEnable:true` is set for a column and there is no template specified for a column</li><li>in all other cases, `readonly:false` is set by default</li></ul></li><li><b>placeholder</b> - (optional) sets a placeholder in the input of ComboBox</li><li><b>virtual</b> - (optional) enables dynamic loading of data on scrolling the list of options, <i>true</i> by default</li><li><b>template</b> - (optional) a function which returns a template with content for the filter options. Takes an option item as a parameter:<ul><li><b>item</b> - (object) an option item</li></ul></li></ul></td>
         </tr>
         <tr>
             <td><a href="../../../configuration/#customizing-headerfooter-filters"><b>customFilter</b></a> </td><td>(optional) a custom function for extended filtering. It takes two parameters:<ul><li><b>item</b> - (required) a data item the value of which should be compared</li><li> <b>input</b> - (required) the value of the option selected in the filter</li></ul>and returns <i>true/false</i> to specify whether the data item should be displayed in the grid after filtering</td>

docs/grid/configuration.md

@@ -1438,7 +1438,7 @@ const grid = new dhx.Grid("grid_container", {
     - the `readonly:true` is set as a default value, if `htmlEnable:true` is set for a column and there is no template specified for a column
     - in all other cases, `readonly:false` is set by default
 - **placeholder** - (*string*) sets a placeholder in the input of ComboBox
-- **virtual** - (*boolean*) enables dynamic loading of data on scrolling the list of options
+- **virtual** - (*boolean*) enables dynamic loading of data on scrolling the list of options, *true* by default
 - **template** - (*function*) a function which returns a template with content for the filter options. Takes an option item as a parameter
 
 #### Customizing header/footer filters

docs/whatsnew.md

@@ -8,6 +8,15 @@ description: You can explore what's new in DHTMLX Suite and its release history
 
 Before updating DHTMLX to the latest version, please check the [Migration to Newer Versions](migration.md) guide to avoid possible breakdowns.
 
+## Version 9.2.3
+
+Released on October 21, 2025
+
+### Fixes
+
+- Grid. Performance issues caused by using `comboFilter` in the Grid header while a large dataset is loaded 
+- Grid. The issue with the "combobox" editor not closing on pressing the "Enter" button
+
 ## Version 9.2.2
 
 Released on October 1, 2025