Steps to reproduce:

1. Load a PDF document with 0 pages

2. Enter some text in the search textbox and click the next/prev buttons

Expected: the search textbox should be either disabled or should ignore any search operation

Actual: an error occurs

Workaround:

    Private Sub pdf_Viewer_DocumentLoaded(sender As Object, e As EventArgs)
        If pdf_Viewer.Document.Pages.Count = 0 Then
            pdf_Toolbar.SearchTextBox.Enabled = False
            pdf_Toolbar.NextButton.Enabled = False
            pdf_Toolbar.PreviousButton.Enabled = False
        Else
            pdf_Toolbar.SearchTextBox.Enabled = True
            pdf_Toolbar.NextButton.Enabled = True
            pdf_Toolbar.PreviousButton.Enabled = True
        End If
    End Sub

Use the attached pdf document and launch the PdfPrintPreviewDialog. As it is demonstrated in the gif file, the preview dialog moves the pages slower than the pdf viewer itself.

Expected behavior: the performance for navigating the pages should be at least identical.

This is the result with R3 2022:

This is the result with R2 2023 SP1:

Load a document with bookmarks and select the bookmarks options. Then, move the splitter:

Expected: the selected option (bookmarks) is unchanged

Actual: the selected option (bookmarks) is not preserved and it is reset

Add functionality for a PDF form filler that supports text auto-sizing/shrinking like Adobe: