WPF - ContextMenu's position doesn't work if grid size is changed by a grid splitter.

[Dragmoria]

Bug Report

• What version of the product are you using?

  • Version CefSharp.wpf 95.7.141, I'm running the MinimalExample.wpf project.

• What architecture x86 or x64?
  Problem occurs on bot x86 and x64

• What version of .Net?
  Problem occurs in MinimalExample.wpf which seems to use .NET 4.5.2. The issue also occurs when I run my own project which is .NET 5.0

• On what operating system?
  Windows 10 Pro

• Are you using WinForms, WPF or OffScreen?
  WPF

• What steps will reproduce the problem?
  I wanted to add a panel to the left of the browser with a treeview and this panel had to be resizable. When I did so i noticed that whenever I right clicked on the browser the context menu shows at the position of the click. But once I resize the grid with a gridsplitter and right click on the browser the context menu does not show at the position of the click.

  To see if this was an issue with my own project I tried adding a gridsplitter to the MinimalExample.WPF project and the same occured here. I have tried to implement Run Cef.DoMessageLoopWork manually in WPF app from amaitland to see if this may help but it didn't affect this issue.

  To reproduce this issue I added a simple gridsplitter to the already existing MainWindow.xaml in the MinimalExample.WPF project.

  <Grid>
      <Grid.ColumnDefinitions>
          <ColumnDefinition Width="50" />
          <ColumnDefinition Width="*" />
      </Grid.ColumnDefinitions>
  
      <Grid Grid.Column="0">
          
      </Grid>
  
      <GridSplitter Grid.Column="0" Width="4"  />
  
      <Grid Grid.Column="1">
          <Grid.RowDefinitions>
              <RowDefinition Height="Auto" />
              <RowDefinition />
              <RowDefinition Height="Auto" />
          </Grid.RowDefinitions>
          <Grid>
              ...
              <!-- CefBrowser sits somewhere here -->
              ...
          </Grid>    
      </Grid>
  </Grid>
  

• What is the expected output? What do you see instead?
  The expected behaviour would be that the context menu would show at the position of the mouseclick but this is not the case. The following two images show the actual output.

  Without Resize:
  

  With resize:
  

  In both cases I clicked on the center of the G. Without a resize it works well but after a resize the position doesn't match.

• Please provide any additional information below.
  I have none.

• Does this problem also occur in the CEF Sample Application
  If MinimalExample.WPF is also a Sample Application then yes. I'm unable to run any of the examples from https://github.com/cefsharp/CefSharp.

[amaitland]

Please test with the 96-pre release. See #3902 (comment)

A custom WPF specific context menu is now used instead of the default CEF native menu (#1767)

[Dragmoria]

I just tried this in my own project and if I remove the web browser menu handler it works now which is awesome, if I don't do that it still does goes to the wrong position. I do wonder how I would go about adding extra items or removing certain items from the context menu if that is at all possible still since using this with a menu handler doesn't work?

[amaitland]

I do wonder how I would go about adding extra items or removing certain items from the context menu if that is at all possible still since using this with a menu handler doesn't work?

You can extend the WPF implementation, see https://github.com/cefsharp/CefSharp/blob/cefsharp/96/CefSharp.Wpf.Example/Handlers/MenuHandler.cs for example of adding a new command, you can customise the existing model as you would normally.

[Dragmoria]

Awesome that all works. Ty very much.