SourceGenerator window now longer steals focus

It would steal focus every time you build, which was super annoying.

src/Plugins/SourceGenerator.Foundations.Windows/Interop/VisualStudio/VisualStudioLogEventSink.cs

@@ -49,7 +49,10 @@ internal VisualStudioLogEventSink(
                         break;
                     }
                 }
+                // Store the currently active window, because adding a new one always draws focus, we don't want that 
+                OutputWindowPane currentActive = s_outputWindow.ActivePane;
                 m_outputPane ??= s_outputWindow.OutputWindowPanes.Add(outputPanelName);
+                currentActive.Activate(); // Set previous one to active
                 m_outputInitialized = m_outputPane != null;
             }
         }