Use attached to reproduce. Broken in version 2018.3.1016.40

Workaround:
private Size minSizeState;
private Size maxSizeState;
protected override void HandleDpiChanged()
{
    //base.HandleDpiChanged();

    float scaleFactor = 1f;

    if (this.oldDpi != 0)
    {
        scaleFactor = (float)this.currentDpi / this.oldDpi;
    }
    else if (this.oldDpi == 0) //Form shown for the first time.
    {
        scaleFactor = (float)this.currentDpi / 96f;
    }

    if (scaleFactor == 1f)
    {
        return;
    }

    this.maxSizeState = this.MaximumSize;
    this.minSizeState = this.MinimumSize;
    this.MinimumSize = Size.Empty;
    this.MaximumSize = Size.Empty;
    
    this.Scale(new SizeF(scaleFactor, scaleFactor));
   
    this.MinimumSize = TelerikDpiHelper.ScaleSize(this.minSizeState, new SizeF(scaleFactor, scaleFactor));
    this.MaximumSize = TelerikDpiHelper.ScaleSize(this.maxSizeState, new SizeF(scaleFactor, scaleFactor));

}

I used RadPageView under the theme "VisualStudio2012LightTheme" .

The ViewMode of RadPageview is Stack.

I wanted to change the font size of page header in runtime but it was not workable.

If I changed the theme to VisualStudio2012DarkTheme or Office2013LightTheme, it worked fine.

The issue can be reproduced by setting the AssociatedControl property in the designer and later at run-time.

ArgumentNullExceptionn in the RadPropertyValuesCollection class.

Currently, the event arguments do not expose the data item.

The issue can be reproduced on a touch device after performing zoom in and zoom out

ChartPanZoomController panZoomController = new ChartPanZoomController();
panZoomController.PanZoomMode = ChartPanZoomMode.Both;
this.radChartView1.Controllers.Add(panZoomController);

 

The issue can be observed in themes having shadows:

- Material 

- Fluent

Use attached to reproduce (the orientation must be set at design time)

Workaround:

Set it in code:

commandBarToggleButton2.Orientation = Orientation.Vertical

Using the RadDocumentEditor class, the users can change the margin of the current section. However, there isn't a method allowing them to change the default section margin of the document. 

Use attached to reproduce. 

One should not be able to use the ribbon bar buttons when a protected document is opened or the rich text editor is read-only. 

Caret jumps several symbols to the right when arabic or persian is used and user deletes the dot symbol. As a result the wrong symbol is deleted.

Other themes are also missing the IsSelected state, the fix should also handle them.

To reproduce:

-double click an option in the MultiColumnCombobox editor and close the editor in the selected index changed event.

The performance of the DayView when the control is bound to a large number of recurring appointments and it is grouped by resources needs to be improved.

Use attached to reproduce.

AutoCompleteSuggestHelper, Assembly: Telerik.WinControls.UI, Version=2019.1.117.40

 

Isnt the hilighted line (contains branch) very unoptimized.

https://rhale78.wordpress.com/2011/05/16/string-equality-and-performance-in-c/

Multiple ToLower string operation. Why not let the framework do the operation since you are always using ordinal?

optimized version: return item.Text.Contains(this.Filter, StringComparison.OrdinalIgnoreCase);

 

protected virtual bool DefaultFilter(RadListDataItem item)
    {
      switch (this.suggestMode)
      {
        case SuggestMode.StartWiths:
          return item.Text.StartsWith(this.Filter, this.StringComparison);
        case SuggestMode.Contains:
          if ((this.StringComparison & StringComparison.InvariantCultureIgnoreCase) == StringComparison.InvariantCultureIgnoreCase || (this.StringComparison & StringComparison.InvariantCultureIgnoreCase) == StringComparison.CurrentCultureIgnoreCase)
            return item.Text.ToLower().Contains(this.Filter.ToLower());
          return item.Text.Contains(this.Filter);
        default:
          return item.Text.StartsWith(this.Filter, this.StringComparison);
      }
    }

 

See the attached screenshot

To reproduce:

Copy an image and paste is several times inside the document.

To reproduce:

- Open the Print Preview dialog and select "Print Entire Workbook"

- Nothing happens and only the current sheet is printed