fix: hide duplicate tooltip (#2224)

lib/pangea/toolbar/widgets/message_selection_positioner.dart

@@ -527,16 +527,19 @@ class MessageSelectionPositionerState extends State<MessageSelectionPositioner>
             top: 0,
             child: MeasureRenderBox(
               onChange: _setTooltipSize,
-              child: Container(
-                constraints: const BoxConstraints(
-                  minWidth: 200.0,
-                  maxWidth: 400.0,
-                ),
-                child: InstructionsInlineTooltip(
-                  instructionsEnum:
-                      widget.overlayController.toolbarMode.instructionsEnum ??
-                          InstructionsEnum.readingAssistanceOverview,
-                  bold: true,
+              child: Opacity(
+                opacity: 0.0,
+                child: Container(
+                  constraints: const BoxConstraints(
+                    minWidth: 200.0,
+                    maxWidth: 400.0,
+                  ),
+                  child: InstructionsInlineTooltip(
+                    instructionsEnum:
+                        widget.overlayController.toolbarMode.instructionsEnum ??
+                            InstructionsEnum.readingAssistanceOverview,
+                    bold: true,
+                  ),
                 ),
               ),
             ),