Issue 1:
flutter_gallery__transition_perf_with_semantics delta_missed_frame_build_budget_count regressed after #12039.

cc @goderbauer

Issue 2:
Performing hot reload...
Reloaded 0 of 415 libraries in 866ms.
flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
flutter: The following assertion was thrown while finalizing the widget tree:
flutter: 'package:flutter/src/widgets/scroll_position.dart': Failed assertion: line 657 pos 12: 'pixels !=
flutter: null': is not true.
flutter:
flutter: Either the assertion indicates an error in the framework itself, or we should provide substantially
flutter: more information in this error message to help you determine and fix the underlying cause.
flutter: In either case, please report this assertion by filing a bug on GitHub:
flutter: https://github.com/flutter/flutter/issues/new
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #2 ScrollPosition.dispose (package:flutter/src/widgets/scroll_position.dart)
flutter: #3 ScrollPositionWithSingleContext.dispose (package:flutter/src/widgets/scroll_position_with_single_context.dart:255:11)
flutter: #4 ScrollableState.dispose (package:flutter/src/widgets/scrollable.dart:324:14)
flutter: #5 StatefulElement.unmount (package:flutter/src/widgets/framework.dart:3821:12)
flutter: #6 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1697:13)
flutter: #7 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #8 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #9 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #10 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #11 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #12 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #13 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #14 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #15 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #16 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #17 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #18 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #19 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #20 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #21 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #22 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #23 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #24 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #25 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #26 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4742:16)
flutter: #27 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #28 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #29 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #30 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #31 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #32 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #33 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #34 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #35 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #36 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #37 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #38 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #39 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #40 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #41 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #42 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #43 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #44 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #45 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #46 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #47 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #48 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #49 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #50 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #51 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #52 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #53 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #54 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #55 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #56 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #57 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #58 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #59 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #60 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #61 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #62 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #63 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #64 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #65 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #66 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #67 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #68 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #69 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #70 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #71 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #72 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #73 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #74 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #75 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #76 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #77 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4742:16)
flutter: #78 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #79 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #80 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #81 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #82 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #83 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #84 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #85 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #86 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #87 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #88 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #89 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #90 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #91 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #92 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #93 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #94 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #95 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #96 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #97 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #98 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #99 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #100 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #101 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #102 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #103 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #104 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #105 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #106 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #107 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #108 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #109 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #110 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #111 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #112 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #113 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #114 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #115 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #116 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #117 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #118 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #119 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #120 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #121 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #122 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #123 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #124 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #125 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #126 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #127 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #128 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #129 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #130 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #131 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #132 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #133 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #134 MultiChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4742:16)
flutter: #135 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #136 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #137 _TheatreElement.visitChildren (package:flutter/src/widgets/overlay.dart:465:14)
flutter: #138 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #139 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #140 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #141 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #142 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #143 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #144 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #145 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #146 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #147 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #148 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #149 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #150 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #151 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #152 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #153 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #154 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #155 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #156 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #157 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #158 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #159 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #160 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #161 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #162 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #163 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #164 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #165 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #166 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #167 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #168 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #169 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #170 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #171 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #172 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #173 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #174 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #175 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #176 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #177 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #178 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #179 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #180 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #181 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #182 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #183 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #184 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #185 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #186 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #187 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #188 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #189 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #190 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #191 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #192 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #193 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #194 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #195 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #196 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #197 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #198 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #199 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #200 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #201 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #202 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #203 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #204 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #205 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #206 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #207 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #208 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #209 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #210 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #211 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #212 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #213 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #214 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #215 SingleChildRenderObjectElement.visitChildren (package:flutter/src/widgets/framework.dart:4642:14)
flutter: #216 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #217 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #218 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #219 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #220 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #221 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #222 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #223 _InactiveElements._unmount.<anonymous closure> (package:flutter/src/widgets/framework.dart:1695:7)
flutter: #224 ComponentElement.visitChildren (package:flutter/src/widgets/framework.dart:3676:14)
flutter: #225 _InactiveElements._unmount (package:flutter/src/widgets/framework.dart:1693:13)
flutter: #226 ListIterable.forEach (dart:_internal/iterable.dart:39:13)
flutter: #227 _InactiveElements._unmountAll (package:flutter/src/widgets/framework.dart:1706:25)
flutter: #228 BuildOwner.finalizeTree.<anonymous closure> (package:flutter/src/widgets/framework.dart:2328:27)
flutter: #229 BuildOwner.lockState (package:flutter/src/widgets/framework.dart:2160:15)
flutter: #230 BuildOwner.finalizeTree (package:flutter/src/widgets/framework.dart:2327:7)
flutter: #231 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:628:18)
flutter: #232 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:208:5)
flutter: #233 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:990:15)
flutter: #234 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:930:9)
flutter: #235 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:842:5)
flutter: #236 _invoke (dart:ui/hooks.dart:120:13)
flutter: #237 _drawFrame (dart:ui/hooks.dart:109:3)
flutter: (elided 2 frames from class _AssertionError)
flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════