Tkinter Grid布局在元素数量超900个后出现堆叠异常

我正在Python 3.6.8中使用tkinter的grid布局创建一个可展开的列表查看器。我做了一个滚动框架，里面用grid布局来排列一系列的元素框架：

正常运行时：所有元素框架按grid的行索引依次整齐排列，布局完全正常

但这个程序在列表元素少于约950个时都没问题，一旦元素数量超过这个阈值，元素就开始堆叠在一起了：

异常状态：本该逐行排列的元素出现重叠堆叠，布局彻底混乱

我特意检查了每个元素的grid行索引数据，确认是完全正确的，输出的索引对应关系如下：

globalListIdx=0     grid('row')Idx=0
globalListIdx=1     grid('row')Idx=1
globalListIdx=2     grid('row')Idx=2
globalListIdx=3     grid('row')Idx=3
globalListIdx=4     grid('row')Idx=4
globalListIdx=5     grid('row')Idx=5
globalListIdx=6     grid('row')Idx=6
globalListIdx=7     grid('row')Idx=7
globalListIdx=8     grid('row')Idx=8
globalListIdx=9     grid('row')Idx=9
globalListIdx=10    grid('row')Idx=10
globalListIdx=11    grid('row')Idx=11
globalListIdx=12    grid('row')Idx=12
globalListIdx=13    grid('row')Idx=13
globalListIdx=14    grid('row')Idx=14
globalListIdx=15    grid('row')Idx=15
globalListIdx=16    grid('row')Idx=16
globalListIdx=17    grid('row')Idx=17
globalListIdx=18    grid('row')Idx=18
globalListIdx=19    grid('row')Idx=19
globalListIdx=20    grid('row')Idx=20
globalListIdx=21    grid('row')Idx=21
globalListIdx=22    grid('row')Idx=22
globalListIdx=23    grid('row')Idx=23
globalListIdx=24    grid('row')Idx=24
globalListIdx=25    grid('row')Idx=25
globalListIdx=26    grid('row')Idx=26
globalListIdx=27    grid('row')Idx=27
globalListIdx=28    grid('row')Idx=28
globalListIdx=29    grid('row')Idx=29
globalListIdx=30    grid('row')Idx=30
globalListIdx=31    grid('row')Idx=31
globalListIdx=32    grid('row')Idx=32
globalListIdx=33    grid('row')Idx=33
globalListIdx=34    grid('row')Idx=34
globalListIdx=35    grid('row')Idx=35
globalListIdx=36    grid('row')Idx=36
globalListIdx=37    grid('row')Idx=37
globalListIdx=38    grid('row')Idx=38
globalListIdx=39    grid('row')Idx=39
globalListIdx=40    grid('row')Idx=40
globalListIdx=41    grid('row')Idx=41
globalListIdx=42    grid('row')Idx=42
globalListIdx=43    grid('row')Idx=43
globalListIdx=44    grid('row')Idx=44
globalListIdx=45    grid('row')Idx=45
globalListIdx=46    grid('row')Idx=46
globalListIdx=47    grid('row')Idx=47
globalListIdx=48    grid('row')Idx=48
globalListIdx=49    grid('row')Idx=49
globalListIdx=50    grid('row')Idx=50
globalListIdx=51    grid('row')Idx=51
globalListIdx=52    grid('row')Idx=52
globalListIdx=53    grid('row')Idx=53
globalListIdx=54    grid('row')Idx=54
globalListIdx=55    grid('row')Idx=55
globalListIdx=56    grid('row')Idx=56
globalListIdx=57    grid('row')Idx=57
globalListIdx=58    grid('row')Idx=58
globalListIdx=59    grid('row')Idx=59
globalListIdx=60    grid('row')Idx=60
globalListIdx=61    grid('row')Idx=61
globalListIdx=62    grid('row')Idx=62
globalListIdx=63    grid('row')Idx=63
globalListIdx=64    grid('row')Idx=64
globalListIdx=65    grid('row')Idx=65
globalListIdx=66    grid('row')Idx=66
globalListIdx=67    grid('row')Idx=67
globalListIdx=68    grid('row')Idx=68
globalListIdx=69    grid('row')Idx=69
globalListIdx=70    grid('row')Idx=70
globalListIdx=71    grid('row')Idx=71
globalListIdx=72    grid('row')Idx=72
globalListIdx=73    grid('row')Idx=73
globalListIdx=74    grid('row')Idx=74
globalListIdx=75    grid('row')Idx=75
globalListIdx=76    grid('row')Idx=76
globalListIdx=77    grid('row')Idx=77
globalListIdx=78    grid('row')Idx=78
globalListIdx=79    grid('row')Idx=79
globalListIdx=80    grid('row')Idx=80
globalListIdx=81    grid('row')Idx=81
globalListIdx=82    grid('row')Idx=82
globalListIdx=83    grid('row')Idx=83
globalListIdx=84    grid('row')Idx=84
globalListIdx=85    grid('row')Idx=85
globalListIdx=86    grid('row')Idx=86
globalListIdx=87    grid('row')Idx=87
globalListIdx=88    grid('row')Idx=88
globalListIdx=89    grid('row')Idx=89
globalListIdx=90    grid('row')Idx=90
globalListIdx=91    grid('row')Idx=91
globalListIdx=92    grid('row')Idx=92
globalListIdx=93    grid('row')Idx=93
globalListIdx=94    grid('row')Idx=94
globalListIdx=95    grid('row')Idx=95
globalListIdx=96    grid('row')Idx=96
globalListIdx=97    grid('row')Idx=97
globalListIdx=98    grid('row')Idx=98
globalListIdx=99    grid('row')Idx=99
globalListIdx=100   grid('row')Idx=100
...
globalListIdx=900   grid('row')Idx=900
globalListIdx=901   grid('row')Idx=901
globalListIdx=902   grid('row')Idx=902
globalListIdx=903   grid('row')Idx=903
globalListIdx=904   grid('row')Idx=904
globalListIdx=905   grid('row')Idx=905
globalListIdx=906   grid('row')Idx=906
globalListIdx=907   grid('row')Idx=907
globalListIdx=908   grid('row')Idx=908
globalListIdx=909   grid('row')Idx=909
globalListIdx=910   grid('row')Idx=910
globalListIdx=911   grid('row')Idx=911
globalListIdx=912   grid('row')Idx=912
globalListIdx=913   grid('row')Idx=913
globalListIdx=914   grid('row')Idx=914
globalListIdx=915   grid('row')Idx=915
globalListIdx=916   grid('row')Idx=916
globalListIdx=917   grid('row')Idx=917
globalListIdx=918   grid('row')Idx=918
globalListIdx=919   grid('row')Idx=919
globalListIdx=920   grid('row')Idx=920
globalListIdx=921   grid('row')Idx=921
globalListIdx=922   grid('row')Idx=922
globalListIdx=923   grid('row')Idx=923
globalListIdx=924   grid('row')Idx=924
globalListIdx=925   grid('row')Idx=925
globalListIdx=926   grid('row')Idx=926
globalListIdx=927   grid('row')Idx=927
globalListIdx=928   grid('row')Idx=928
globalListIdx=929   grid('row')Idx=929
globalListIdx=930   grid('row')Idx=930
globalListIdx=931   grid('row')Idx=931
globalListIdx=932   grid('row')Idx=932
globalListIdx=933   grid('row')Idx=933
globalListIdx=934   grid('row')Idx=934
globalListIdx=935   grid('row')Idx=935
globalListIdx=936   grid('row')Idx=936
globalListIdx=937   grid('row')Idx=937
globalListIdx=938   grid('row')Idx=938
globalListIdx=939   grid('row')Idx=939
globalListIdx=940   grid('row')Idx=940
globalListIdx=941   grid('row')Idx=941
globalListIdx=942   grid('row')Idx=942
globalListIdx=943   grid('row')Idx=943
globalListIdx=944   grid('row')Idx=944
globalListIdx=945   grid('row')Idx=945
globalListIdx=946   grid('row')Idx=946
globalListIdx=947   grid('row')Idx=947
globalListIdx=948   grid('row')Idx=948
globalListIdx=949   grid('row')Idx=949
globalListIdx=950   grid('row')Idx=950
globalListIdx=951   grid('row')Idx=951
globalListIdx=952   grid('row')Idx=952
globalListIdx=953   grid('row')Idx=953
globalListIdx=954   grid('row')Idx=954
globalListIdx=955   grid('row')Idx=955
globalListIdx=956   grid('row')Idx=956
globalListIdx=957   grid('row')Idx=957
globalListIdx=958   grid('row')Idx=958
globalListIdx=959   grid('row')Idx=959
globalListIdx=960   grid('row')Idx=960
globalListIdx=961   grid('row')Idx=961
globalListIdx=962   grid('row')Idx=962
globalListIdx=963   grid('row')Idx=963
globalListIdx=964   grid('row')Idx=964
globalListIdx=965   grid('row')Idx=965
globalListIdx=966   grid('row')Idx=966
globalListIdx=967   grid('row')Idx=967
globalListIdx=968   grid('row')Idx=968
globalListIdx=969   grid('row')Idx=969
globalListIdx=970   grid('row')Idx=970
globalListIdx=971   grid('row')Idx=971
globalListIdx=972   grid('row')Idx=972
globalListIdx=973   grid('row')Idx=973
globalListIdx=974   grid('row')Idx=974
globalListIdx=975   grid('row')Idx=975
globalListIdx=976   grid('row')Idx=976
globalListIdx=977   grid('row')Idx=977
globalListIdx=978   grid('row')Idx=978
globalListIdx=979   grid('row')Idx=979
globalListIdx=980   grid('row')Idx=980
globalListIdx=981   grid('row')Idx=981
globalListIdx=982   grid('row')Idx=982
globalListIdx=983   grid('row')Idx=983
globalListIdx=984   grid('row')Idx=984
globalListIdx=985   grid('row')Idx=985
globalListIdx=986   grid('row')Idx=986
globalListIdx=987   grid('row')Idx=987
globalListIdx=988   grid('row')Idx=988
globalListIdx=989   grid('row')Idx=989
globalListIdx=990   grid('row')Idx=990
globalListIdx=991   grid('row')Idx=991
globalListIdx=992   grid('row')Idx=992
globalListIdx=993   grid('row')Idx=993
globalListIdx=994   grid('row')Idx=994
globalListIdx=995   grid('row')Idx=995
globalListIdx=996   grid('row')Idx=996
globalListIdx=997   grid('row')Idx=997
globalListIdx=998   grid('row')Idx=998
globalListIdx=999   grid('row')Idx=999
globalListIdx=1000  grid('row')Idx=1000
globalListIdx=1001  grid('row')Idx=1001
globalListIdx=1002  grid('row')Idx=1002
globalListIdx=1003  grid('row')Idx=1003
globalListIdx=1004  grid('row')Idx=1004
globalListIdx=1005  grid('row')Idx=1005
globalListIdx=1006  grid('row')Idx=1006
globalListIdx=1007  grid('row')Idx=1007
globalListIdx=1008  grid('row')Idx=1008
globalListIdx=1009  grid('row')Idx=1009
globalListIdx=1010  grid('row')Idx=1010
globalListIdx=1011  grid('row')Idx=1011
globalListIdx=1012  grid('row')Idx=1012
globalListIdx=1013  grid('row')Idx=1013
globalListIdx=1014  grid('row')Idx=1014
globalListIdx=1015  grid('row')Idx=1015
globalListIdx=1016  grid('row')Idx=1016
globalListIdx=1017  grid('row')Idx=1017
globalListIdx=1018  grid('row')Idx=1018
globalListIdx=1019  grid('row')Idx=1019
globalListIdx=1020  grid('row')Idx=1020
globalListIdx=1021  grid('row')Idx=1021
globalListIdx=1022  grid('row')Idx=1022
globalListIdx=1023  grid('row')Idx=1023
globalListIdx=1024  grid('row')Idx=1024
globalListIdx=1025  grid('row')Idx=1025
globalListIdx=1026  grid('row')