Allow only single instance of HashtagDialog

stevencohn#1228

OneMore/Commands/Tagging/HashtagCommand.cs

@@ -16,6 +16,8 @@ internal class HashtagCommand : Command
  private HashtagDialog.Commands command;
  private IEnumerable<string> pageIds;
 
+ private static HashtagDialog dialog;
+
  public HashtagCommand()
  {
  // prevent replay
@@ -25,7 +27,17 @@ public HashtagCommand()
 
  public override async Task Execute(params object[] args)
  {
- using var dialog = new HashtagDialog();
+ if (dialog != null)
+ {
+ logger.WriteLine("+++ dialog exists");
+ dialog.ForceTopMost();
+ dialog.Activate();
+ dialog.TopMost = false;
+ return;
+ }
+
+ dialog = new HashtagDialog();
+ dialog.FormClosed += Dialog_FormClosed;
 
  await dialog.RunModeless((sender, e) =>
  {
@@ -46,6 +58,15 @@ await dialog.RunModeless((sender, e) =>
  20);
  }
 
+ private void Dialog_FormClosed(object sender, FormClosedEventArgs e)
+ {
+ if (dialog != null)
+ {
+ dialog.FormClosed -= Dialog_FormClosed;
+ dialog.Dispose();
+ dialog = null;
+ }
+ }
 
  private async Task Callback(string sectionId)
  {