PdfViewer goes to mobilelayout when resized.

[ykarpeev]

Describe the bug

Hello, I am trying to use PDFViewer to just show a PDF while hiding all controls - this is working OK but I noticed that if I resize the application a few controls suddenly show up. Here are some screenshots:

Everything looking as expected:

After resizing the width of the application:

I can also see IsMobileLayout turn to true when this happens:

And if I set it to false the unwanted controls go away.

To Reproduce

• Create a PDF Viewer control

• Resize application down

• Observe buttons show up.

    <pdf:PdfViewer x:Name="Viewer"
                   
                   DocumentSource="{Binding Pdf}"
                   ViewMode="Continuous"
                   IsSidebarVisible="False"
                   IsHighlightToolVisible="False"
                   IsUnderlineToolVisible="False"
                   IsStrikethroughToolVisible="False"
                   IsSquigglyToolVisible="False"
                   IsRedactToolVisible="False"
                   IsDrawToolVisible="False"
                   IsShapeToolVisible="False"
                   IsTextToolVisible="False"
                   IsNoteToolVisible="False"
                   IsLinkToolVisible="False"
                   IsStampToolVisible="False"
                   IsPrintVisible="False"
                   IsMoreOptionsVisible="False"
                   IsToolbarVisible="False" 
                   AllowAnnotationEditing="False"
                   IsMobileLayout="False"
                   IsReadOnly="True"
                   AllowDocumentSaving="False"
                   AllowTextSelection="False"
                   AllowFormEditing="False"
                   SidebarMode="None" />
  

Expected behavior

I expect the additional buttons to stay hidden regardless of the size of the control.

Avalonia version

12.1.3

OS

Windows

Additional context

No response

[ykarpeev]

I am working around this currently by setting IsMobileLayout to false whenever it changes to true in code behind.

if (e.Property.Name.Equals(nameof(this.Viewer.IsMobileLayout)))
{
    if (this.Viewer.IsMobileLayout)
    {
        this.Viewer.IsMobileLayout = false;
    }
}