fix(): first touch gesture

[ShaMan123]

Description

closes #9682

mainTouchId seems to have been migrated wrongly, without a default null value, hence the condition testing if mainTouchId === null would fail in the first touchstart because it was undefined but would pass the second time because touchend would set it to null
I changed it to be undefined instead of null and that fixed it.

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Build Stats

file / KB (diff)	bundled	minified
fabric	909.312 (+0.005)	304.614 (+0.004)

[ShaMan123]

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[ShaMan123]

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I am not sure why but the sandbox has the wrong target branch

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Coverage after merging fix/9682 into master will be

82.72%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
index.node.ts	14.29%	100%	0%	25%	23, 26, 29, 41, 44, 47
src
ClassRegistry.ts	100%	100%	100%	100%
Collection.ts	94.85%	94.83%	87.10%	97.14%	109, 112, 215–216, 241–242
CommonMethods.ts	96.55%	87.50%	100%	100%	9
Intersection.ts	100%	100%	100%	100%
Observable.ts	87.76%	85.29%	87.50%	89.58%	134–135, 160–161, 32–33, 41, 50, 78, 89
Point.ts	100%	100%	100%	100%
Shadow.ts	98.55%	95.65%	100%	100%	213
cache.ts	97.06%	90%	100%	100%	57
config.ts	74.14%	65%	66.67%	82.76%	131, 139, 139, 139, 139, 139–141, 152–154, 30
constants.ts	100%	100%	100%	100%
src/LayoutManager
LayoutManager.ts	87.58%	89.29%	76.92%	90.14%	151–152, 154–155, 155, 155, 155, 155, 249, 307–308, 319, 51
constants.ts	100%	100%	100%	100%
src/LayoutManager/LayoutStrategies
ClipPathLayout.ts	82.05%	72.22%	100%	88.89%	30–31, 42, 54, 57–58, 65
FitContentLayout.ts	100%	100%	100%	100%
FixedLayout.ts	20%	0%	0%	40%	20–21, 23, 23, 23, 23, 23
LayoutStrategy.ts	86%	64.71%	100%	96.15%	36, 43, 43, 43, 51, 71–72
utils.ts	91.67%	85.71%	100%	100%	28, 34
src/Pattern
Pattern.ts	90.54%	93.94%	80%	90.32%	119, 130, 139, 32, 36
src/brushes
BaseBrush.ts	100%	100%	100%	100%
CircleBrush.ts	0%	0%	0%	0%	108, 108, 108, 110, 112, 114–116, 118–121, 128–129, 13, 136, 138, 23–24, 32–36, 40–44, 51–54, 62–66, 68, 76, 76, 76, 76, 76–77, 79, 79, 79–82, 84, 92–93, 95, 97–99
PatternBrush.ts	97.06%	87.50%	100%	100%	21
PencilBrush.ts	91.06%	82.35%	100%	93.81%	122–123, 152, 152–154, 176, 176, 276, 280, 285–286, 68–69, 84–85
SprayBrush.ts	0%	0%	0%	0%	107, 107, 107, 107, 107–108, 110–111, 118–119, 121, 123–127, 136, 140–141, 141, 148, 148, 148–151, 153–156, 160–161, 163, 165–168, 17, 171, 178–179, 18, 181, 183–184, 186, 193–194, 196–197, 20, 200, 200, 207, 207, 21, 211, 22, 22, 22–24, 28, 32, 39, 46, 53, 60, 67, 84–86, 94–96, 98–99
src/canvas
Canvas.ts	78.66%	77.04%	82.14%	79.33%	1001–1003, 1006–1007, 1011–1012, 1123–1125, 1128–1129, 1202, 1314, 1435, 158, 183, 289, 289–294, 299, 322–323, 328–333, 353, 353, 353–354, 354, 354–355, 363, 368–369, 369, 369–370, 372, 381, 387–388, 388, 388, 42, 431, 439, 443, 443, 443–444, 446, 46, 528–529, 529, 529–530, 536, 536, 536–538, 558, 560, 560, 560–561, 561, 561, 564, 564, 564–565, 568, 577–578, 580–581, 583, 583–584, 586–587, 599–600, 600, 600–601, 603–608, 614, 621, 658, 658, 658, 660, 662–667, 673, 679, 679, 679–680, 682, 685, 690, 703, 731, 783–784, 784, 784, 784, 784, 784, 787–788, 791, 791–793, 796–797, 879, 886, 886, 886, 899, 928–929, 929, 929–931, 934–935, 935, 935, 937, 945, 945, 945–947, 947, 947, 954–955, 963–964, 964, 964–965, 971, 973
CanvasOptions.ts	100%	100%	100%	100%
SelectableCanvas.ts	90.22%	87.30%	94.55%	91.74%	1004, 1012, 1123, 1125, 1127–1128, 1199, 1220–1221, 1239–1240, 460–461, 463–464, 464, 464, 513–514, 591, 596, 666, 671–672, 699–700, 724, 727–730, 730, 730–731, 731, 731, 737–738, 740, 760–761, 766–770, 772, 807–808, 811, 811, 811–812, 931, 931–932, 935, 955, 955
StaticCanvas.ts	96.44%	92.72%	98.91%	98.27%	1045, 1055, 1106–1108, 1111, 1146–1147, 1223, 1232, 1232, 1236, 1236, 1283–1284, 188–189, 205, 585, 597–598, 928–929, 929, 929–930
StaticCanvasOptions.ts	100%	100%	100%	100%
TextEditingManager.ts	86%	71.43%	91.67%	91.67%	17, 17, 17–18, 18, 18
src/canvas/DOMManagers
CanvasDOMManager.ts	95.52%	70%	100%	100%	21–22, 29
StaticCanvasDOMManager.ts	97.50%	88.89%	100%	100%	33
util.ts	86.67%	80.56%	83.33%	93.94%	14, 26, 63–64, 67, 67, 74, 93–94
src/color
Color.ts	94.96%	91.67%	96.30%	96.05%	233, 258–259, 267–268, 48
color_map.ts	100%	100%	100%	100%
constants.ts	100%	100%	100%	100%
util.ts	85.71%	76.92%	100%	89.74%	55–56, 56, 58, 58, 58–59, 61–62, 89
src/controls
Control.ts	94.44%	93.10%	91.67%	96.77%	183, 249, 354
changeWidth.ts	100%	100%	100%	100%
commonControls.ts	100%	100%	100%	100%
controlRendering.ts	81.63%	78%	100%	84.78%	106, 111, 121, 121, 45, 50, 61, 61, 65–72, 81–82
drag.ts	100%	100%	100%	100%
fireEvent.ts	88.89%	75%	100%	100%	13
polyControl.ts	10.87%	0%	0%	16.13%	114, 114, 114, 114, 114, 116–119, 119, 122, 129, 24–26, 50–52, 58–59, 61, 71, 77–79, 79, 81, 84, 86, 90–92, 94, 99
rotate.ts	19.57%	12.50%	50%	21.43%	41, 45, 51, 51, 51–52, 55–57, 59, 59,