An assert in LayoutConfig.getMinPixel fires sometimes

[winksaville]

I was writing an application that uses charts and was testing it on an an Android device using a USB cable. When I tested the app with the display off (i.e. phone is on my desk, the display is off because the phone is "sleeping") and I run the app I see an assertion that '_minPixel < totalPixels:' is not true, see below.

I created this very simple test app which reproduces the problem.

wink@wink-desktop:~/prgs/flutter/projects/charts_issue_minPixel_LT_totalPixels (master)
$ flutter run -d moto
Launching lib/main.dart on moto x4 in debug mode...
Running Gradle task 'assembleDebug'...                                  
Running Gradle task 'assembleDebug'... Done                        18.9s
✓ Built build/app/outputs/flutter-apk/app-debug.apk.
Installing build/app/outputs/flutter-apk/app.apk...                 7.1s
Waiting for moto x4 to report its views...                          12ms
Syncing files to device moto x4...                                 506ms

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h Repeat this help message.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).
An Observatory debugger and profiler on moto x4 is available at: http://127.0.0.1:35693/VswkvMW4sUY=/
I/flutter (17446): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter (17446): The following assertion was thrown during performLayout():
I/flutter (17446): 'package:charts_common/src/chart/layout/layout_config.dart': Failed assertion: line 101 pos 14:
I/flutter (17446): '_minPixel < totalPixels': is not true.
I/flutter (17446): 
I/flutter (17446): The relevant error-causing widget was:
I/flutter (17446):   ChartContainer<num>
I/flutter (17446):   file:///home/wink/prgs/flutter/projects/charts_issue_minPixel_LT_totalPixels/submodules/charts/charts_flutter/lib/src/base_chart_state.dart:89:32
I/flutter (17446): 
I/flutter (17446): When the exception was thrown, this was the stack:
I/flutter (17446): #2      MarginSpec.getMinPixels (package:charts_common/src/chart/layout/layout_config.dart:101:14)
I/flutter (17446): #3      LayoutManagerImpl._measure (package:charts_common/src/chart/layout/layout_manager_impl.dart:305:54)

...

I/flutter (17446): #60     PipelineOwner.flushLayout (package:flutter/src/rendering/object.dart:887:18)
I/flutter (17446): #61     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:402:19)
I/flutter (17446): #62     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:865:13)
I/flutter (17446): #63     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:284:5)
I/flutter (17446): #64     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1074:15)
I/flutter (17446): #65     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1013:9)
I/flutter (17446): #66     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:822:7)
I/flutter (17446): (elided 13 frames from class _AssertionError, class _RawReceivePortImpl, class _Timer, dart:async, and dart:async-patch)
I/flutter (17446): 
I/flutter (17446): The following RenderObject was being processed when the exception was fired: ChartContainerRenderObject<num>#137e2 NEEDS-LAYOUT NEEDS-PAINT:
I/flutter (17446):   creator: ChartContainer<num> ← _PointerListener ← Listener ← _GestureSemantics ← RawGestureDetector
I/flutter (17446):     ← GestureDetector ← LayoutId-[<chartContainer>] ← CustomMultiChildLayout ← LineChart ←
I/flutter (17446):     SimpleLineChart ← Container ← _BodyBuilder ← ⋯
I/flutter (17446):   parentData: <none> (can use size)
I/flutter (17446):   constraints: BoxConstraints(w=0.0, h=0.0)
I/flutter (17446):   semantic boundary
I/flutter (17446):   size: MISSING
I/flutter (17446): This RenderObject has no descendants.
I/flutter (17446): ════════════════════════════════════════════════════════════════════════════════════════════════════
I/flutter (17446): Another exception was thrown: RenderBox was not laid out: ChartContainerRenderObject<num>#137e2 NEEDS-PAINT
I/flutter (17446): Another exception was thrown: RenderBox was not laid out: RenderPointerListener#889de NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (17446): Another exception was thrown: RenderBox was not laid out: RenderSemanticsGestureHandler#be907 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE
I/flutter (17446): Another exception was thrown: RenderBox was not laid out: ChartContainerRenderObject<num>#137e2

[winksaville]

I've created PR #457 which is a fix for this issue.