Add the same timer based delay to the db tree filter as for the filter panel in r2627, was also complained about in issue #1350.

source/main.dfm

@@ -6729,4 +6729,11 @@ object MainForm: TMainForm
     Left = 40
     Top = 269
   end
+  object TimerFilterDBTree: TTimer
+    Enabled = False
+    Interval = 500
+    OnTimer = TimerFilterDBTreeTimer
+    Left = 136
+    Top = 269
+  end
 end

source/main.pas

@@ -449,6 +449,7 @@ type
     actFilterPanel: TAction;
     actFindInVT1: TMenuItem;
     TimerFilterVT: TTimer;
+    TimerFilterDBTree: TTimer;
     procedure refreshMonitorConfig;
     procedure loadWindowConfig;
     procedure saveWindowConfig;
@@ -733,6 +734,7 @@ type
     procedure comboOnlyDBsKeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
     procedure actFilterPanelExecute(Sender: TObject);
     procedure TimerFilterVTTimer(Sender: TObject);
+    procedure TimerFilterDBTreeTimer(Sender: TObject);
   private
     ReachedEOT                 : Boolean;
     FDelimiter: String;
@@ -9573,7 +9575,16 @@ end;
 
 procedure TMainForm.comboOnlyDBsChange(Sender: TObject);
 begin
-  // Immediately apply database filter
+  // Reset editing timer
+  TimerFilterDBTree.Enabled := False;
+  TimerFilterDBTree.Enabled := True;
+end;
+
+
+procedure TMainForm.TimerFilterDBTreeTimer(Sender: TObject);
+begin
+  // Apply database filter as the user has finished typing
+  TimerFilterDBTree.Enabled := False;
   RefreshTree(False);
 end;