Run the attached project on a monitor with 100% DPI scaling and open the Excel-like filter popup:

100%:

After moving the form to the second monitor with 150% DPI scaling, the filter popup is not OK:

150%:

The popup is smaller and smaller with each next opening (see the attached gif file) at 150%. If you decide to move back the form on the monitor with 100% DPI scaling, the filter popup is not scaled properly.

ConditionalFormatting dialog elements are overlapping in the Windows 11 theme. The text is clipped on the right:

DateTime and TimeSpanPicker editors popup is not resized to fit the content in Windows 11 theme;

In this case, we have an enum column. When the DataFilter dialog is shown and we click to enter the filter value, an exception is thrown.

Load-On-Demand self-reference hierarchy provider

In this case, the cell contains the following string: körte. When copying the cell while it is in non-edit mode, and pasting the value in another cell, the pasted string is the following one: körte

Checking the select column header cell won't select the rows that are hidden. Thus in a grouping scenario, the group checkbox to an intermediate state. This will lead to confusion that there are still un-selected items, while all visible items are selected.

The current behavior clears the selection when doing so.

1. Group by some column or create hierarchy.
2. Select all from the parent header check box or in the header.
3. Expand parent row
4. As a result, the row expands, but selection disappears.

How to reproduce: Create a DPI-aware application and run it on a Windows 10 machine on 125%, the text inside the editors is smaller compared to the text in cells which are not in edit mode.

Workaround: 
private void RadGridView1_CellEditorInitialized(object sender, GridViewCellEventArgs e)
{
    BaseInputEditor editor = e.ActiveEditor as BaseInputEditor;

    if (editor != null)
    {
        RadTextBoxItem item = editor.EditorElement.FindDescendant<RadTextBoxItem>();

        if (item != null)
        {
            item.HostedControl.Font = this.radGridView1.GridViewElement.GetScaledFont(this.radGridView1.GridViewElement.DpiScaleFactor.Height);
        }
    }
} 

Enable the ability to MERGE seperate rows (different records), like found in ITunes "Songs" mode where is shows the artwork (then artist,release undernearth) in a custom class, then the related song rows to the right.

Your competitor Dev Express has it already in place.

See youtube video here :

https://www.youtube.com/watch?v=TfPXwE7GcXs

Cheers

maskBoxColumn.FormatInfo = CultureInfo.CreateSpecificCulture("en-AE");

In this case, we have null values in some cells. When filtering the column, these cells will be ignored. 

While the Excel-Like filtering dialog is open and the mouse is over the RadGridView rows, moving the mouse wheel will scroll both the filtering dialog and the rows.

NullReferenceException occurs in a multi-select scenario when clicking (and holding the mouse button) on an empty area in the grid and the mouse leaves the boundaries of the control.

In this scenario, the RadGridView.DataSource property is set to Microsoft.EntityFrameworkCore.ChangeTracking.ObservableCollectionListSource. When the RadGridView.Rows.Remove() method is called an IndexOutOfRange exception is thrown.

 

In this case, the RadGridView is in the Self-Reference hierarchy. When the value of a cell is changed runtime, we are populating the bound (BindingList) collection with new items. All BindingList notifications will be called, however, the internal RadListSource in the RadGridView won't be updated, thus leading to a ArgumentOutOfRangeException.

In the description of the RowIndent property is mentioned that this will indent groups and hierarchy rows.  However, it can indent group rows only. 

Holding CTRL + C on a cell for a couple of seconds will throw ExternalException.