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[0.83] fix: Unicode Text length Calculation#16240

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[0.83] fix: Unicode Text length Calculation#16240
vineethkuttan wants to merge 1 commit into
0.83-stablefrom
unicode83

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@vineethkuttan

@vineethkuttan vineethkuttan commented Jun 10, 2026 •
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Description

The length of text that is being rendered is not calculated for Unicode characters, this change will fix it

Type of Change

  • Bug fix (non-breaking change which fixes an issue)

Why

Text Highlight for Unicode is not working

Screenshots

image

Testing

Tested in Playground

Changelog

Should this change be included in the release notes: yes

(fix: Unicode Text length Calculation)

Microsoft Reviewers: Open in CodeFlow

@vineethkuttan @rnbot
fix: Unicode Text length Calculation (#16219)
82b53d2 
* fix: Unicode Text length Calculation

* Change files

* yarn format fix
@vineethkuttan vineethkuttan requested a review from a team as a code owner June 10, 2026 11:11
@vineethkuttan vineethkuttan changed the title fix: Unicode Text length Calculation (#16219) [0.83] fix: Unicode Text length Calculation Jun 10, 2026
iamAbhi-916
iamAbhi-916 approved these changes Jun 10, 2026
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@iamAbhi-916 iamAbhi-916 left a comment

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LGTM

@github-actions

github-actions Bot commented Jun 10, 2026

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Performance Test Results

Branch: unicode83
Commit: 16a93b84
Time: 2026-06-10T11:34:55.937Z
Tests: 161/161 passed

✅ Passed

161 scenario(s) across 28 suite(s) — no regressions

SectionList

Scenario Mean Median StdDev Renders vs Baseline
SectionList mount 4.60ms 5.00ms ±0.84ms 1 +0.0%
SectionList unmount 0.40ms 0.00ms ±0.52ms 0 +0.0%
SectionList rerender 10.30ms 10.00ms ±1.34ms 2 -4.8%
SectionList with-3-sections-15-items 5.30ms 5.00ms ±1.42ms 1 -9.1%
SectionList with-5-sections-50-items 5.30ms 5.00ms ±0.95ms 1 -16.7%
SectionList with-10-sections-200-items 5.40ms 5.00ms ±1.65ms 1 -9.1%
SectionList with-20-sections-200-items 5.20ms 5.00ms ±2.74ms 1 +0.0%
SectionList with-section-separator 1.60ms 2.00ms ±0.52ms 1 +0.0%
SectionList with-item-separator 1.70ms 2.00ms ±0.67ms 1 +0.0%
SectionList with-header-footer 1.30ms 1.00ms ±0.48ms 1 -50.0%
SectionList with-section-footer 1.50ms 1.50ms ±0.53ms 1 -25.0%
SectionList with-sticky-section-headers 2.20ms 2.00ms ±1.75ms 1 +0.0%
SectionList with-empty-list 0.50ms 0.50ms ±0.53ms 1 -50.0%
SectionList with-50-sections-1000-items 1.30ms 1.00ms ±0.48ms 1 -50.0%

FlatList

Scenario Mean Median StdDev Renders vs Baseline
FlatList mount 4.00ms 4.00ms ±0.82ms 1 +0.0%
FlatList unmount 0.20ms 0.00ms ±0.42ms 0 +0.0%
FlatList rerender 9.00ms 8.00ms ±1.76ms 2 -11.1%
FlatList with-10-items 4.30ms 4.00ms ±0.48ms 1 +0.0%
FlatList with-100-items 4.80ms 4.50ms ±1.23ms 1 -10.0%
FlatList with-500-items 4.20ms 4.00ms ±0.63ms 1 +0.0%
FlatList with-1000-items 4.80ms 4.00ms ±1.55ms 1 +0.0%
FlatList horizontal 3.70ms 4.00ms ±1.06ms 1 -20.0%
FlatList with-separator 1.80ms 1.00ms ±1.55ms 1 -50.0%
FlatList with-header-footer 1.30ms 1.00ms ±0.48ms 1 -50.0%
FlatList with-empty-list 0.50ms 0.50ms ±0.53ms 1 +0.0%
FlatList with-get-item-layout 1.90ms 1.50ms ±1.52ms 1 +50.0%
FlatList inverted 1.20ms 1.00ms ±0.42ms 1 -33.3%
FlatList with-num-columns 3.10ms 3.00ms ±1.79ms 1 +0.0%

TouchableOpacity

Scenario Mean Median StdDev Renders vs Baseline
TouchableOpacity mount 0.90ms 1.00ms ±0.32ms 1 +0.0%
TouchableOpacity unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
TouchableOpacity rerender 1.30ms 1.00ms ±0.48ms 2 +0.0%
TouchableOpacity custom-active-opacity 0.50ms 0.50ms ±0.53ms 1 -50.0%
TouchableOpacity disabled 0.60ms 1.00ms ±0.52ms 1 +0.0%
TouchableOpacity with-all-handlers 0.60ms 1.00ms ±0.52ms 1 +0.0%
TouchableOpacity with-hit-slop 1.00ms 1.00ms ±0.00ms 1 +0.0%
TouchableOpacity with-delay 0.60ms 1.00ms ±0.52ms 1 +0.0%
TouchableOpacity nested 1.30ms 1.00ms ±0.48ms 1 +0.0%
TouchableOpacity multiple-10 5.53ms 5.00ms ±1.41ms 1 -16.7%
TouchableOpacity multiple-50 28.47ms 29.00ms ±2.80ms 1 +0.0%
TouchableOpacity multiple-100 42.27ms 49.00ms ±11.61ms 1 -2.0%

ScrollView

Scenario Mean Median StdDev Renders vs Baseline
ScrollView mount 0.40ms 0.00ms ±0.52ms 1 +0.0%
ScrollView unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
ScrollView rerender 0.60ms 1.00ms ±0.52ms 2 +0.0%
ScrollView children-20 3.07ms 3.00ms ±1.16ms 1 -25.0%
ScrollView children-100 16.47ms 15.00ms ±3.42ms 1 -6.3%
ScrollView horizontal 3.60ms 3.00ms ±1.26ms 1 -25.0%
ScrollView sticky-headers 2.70ms 3.00ms ±0.95ms 1 +0.0%
ScrollView scroll-indicators 0.70ms 1.00ms ±0.48ms 1 +0.0%
ScrollView nested 1.20ms 1.00ms ±0.63ms 1 +0.0%
ScrollView content-container-style 0.70ms 1.00ms ±0.48ms 1 +0.0%
ScrollView children-500 19.73ms 19.00ms ±3.59ms 1 +0.0%

TouchableHighlight

Scenario Mean Median StdDev Renders vs Baseline
TouchableHighlight mount 0.40ms 0.00ms ±0.52ms 1 -100.0%
TouchableHighlight unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
TouchableHighlight rerender 0.60ms 1.00ms ±0.52ms 2 +0.0%
TouchableHighlight custom-underlay-color 0.10ms 0.00ms ±0.32ms 1 +0.0%
TouchableHighlight custom-active-opacity 0.40ms 0.00ms ±0.52ms 1 +0.0%
TouchableHighlight disabled 0.40ms 0.00ms ±0.52ms 1 +0.0%
TouchableHighlight with-all-handlers 0.20ms 0.00ms ±0.42ms 1 +0.0%
TouchableHighlight with-hit-slop 0.30ms 0.00ms ±0.48ms 1 +0.0%
TouchableHighlight nested-touchables 1.30ms 1.00ms ±1.34ms 1 +0.0%
TouchableHighlight multiple-touchables-10 2.20ms 2.00ms ±0.42ms 1 -33.3%
TouchableHighlight multiple-touchables-50 12.80ms 12.50ms ±1.75ms 1 +0.0%
TouchableHighlight multiple-touchables-100 22.90ms 23.00ms ±4.36ms 1 +2.2%

Pressable

Scenario Mean Median StdDev Renders vs Baseline
Pressable mount 0.30ms 0.00ms ±0.48ms 1 +0.0%
Pressable unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Pressable rerender 0.70ms 1.00ms ±0.48ms 2 +100.0%
Pressable with-all-handlers 0.20ms 0.00ms ±0.42ms 1 +0.0%
Pressable with-style-function 0.00ms 0.00ms ±0.00ms 1 +0.0%
Pressable disabled 0.30ms 0.00ms ±0.48ms 1 +0.0%
Pressable with-hit-slop 0.20ms 0.00ms ±0.42ms 1 +0.0%
Pressable nested 0.60ms 1.00ms ±0.52ms 1 +0.0%
Pressable multiple-10 2.87ms 3.00ms ±0.35ms 1 +0.0%
Pressable multiple-50 13.53ms 14.00ms ±2.33ms 1 +0.0%
Pressable multiple-100 15.73ms 11.00ms ±9.47ms 1 -8.3%

Modal

Scenario Mean Median StdDev Renders vs Baseline
Modal mount 0.30ms 0.00ms ±0.48ms 1 +0.0%
Modal unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Modal rerender 0.60ms 1.00ms ±0.52ms 2 +Infinity%
Modal slide-animation 0.30ms 0.00ms ±0.48ms 1 +0.0%
Modal fade-animation 0.30ms 0.00ms ±0.48ms 1 +0.0%
Modal transparent 0.40ms 0.00ms ±0.52ms 1 +0.0%
Modal with-callbacks 0.30ms 0.00ms ±0.48ms 1 +0.0%
Modal rich-content 1.50ms 1.50ms ±0.53ms 1 -25.0%
Modal with-accessibility 0.20ms 0.00ms ±0.42ms 1 +0.0%

Image

Scenario Mean Median StdDev Renders vs Baseline
Image mount 0.20ms 0.00ms ±0.42ms 1 +0.0%
Image unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Image rerender 0.00ms 0.00ms ±0.00ms 2 +0.0%
Image with-resize-mode 0.00ms 0.00ms ±0.00ms 1 +0.0%
Image with-border-radius 0.10ms 0.00ms ±0.32ms 1 +0.0%
Image with-tint-color 0.00ms 0.00ms ±0.00ms 1 +0.0%
Image with-blur-radius 0.00ms 0.00ms ±0.00ms 1 +0.0%
Image with-accessibility 0.10ms 0.00ms ±0.32ms 1 +0.0%
Image multiple-10 0.87ms 1.00ms ±0.35ms 1 +0.0%
Image multiple-50 3.73ms 4.00ms ±1.33ms 1 +33.3%
Image multiple-100 7.73ms 7.00ms ±1.33ms 1 -12.5%

ActivityIndicator

Scenario Mean Median StdDev Renders vs Baseline
ActivityIndicator mount 0.00ms 0.00ms ±0.00ms 1 +0.0%
ActivityIndicator unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
ActivityIndicator rerender 0.30ms 0.00ms ±0.48ms 2 +0.0%
ActivityIndicator size-large 0.00ms 0.00ms ±0.00ms 1 +0.0%
ActivityIndicator size-small 0.10ms 0.00ms ±0.32ms 1 +0.0%
ActivityIndicator with-color 0.20ms 0.00ms ±0.42ms 1 +0.0%
ActivityIndicator not-animating 0.10ms 0.00ms ±0.32ms 1 +0.0%
ActivityIndicator with-accessibility 0.20ms 0.00ms ±0.42ms 1 +0.0%
ActivityIndicator multiple-10 0.80ms 1.00ms ±0.41ms 1 +0.0%
ActivityIndicator multiple-50 3.73ms 4.00ms ±1.33ms 1 +0.0%
ActivityIndicator multiple-100 7.47ms 7.00ms ±1.36ms 1 +0.0%

Switch

Scenario Mean Median StdDev Renders vs Baseline
Switch mount 0.30ms 0.00ms ±0.48ms 1 +0.0%
Switch unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Switch rerender 0.50ms 0.50ms ±0.53ms 2 +0.0%
Switch value-true 0.30ms 0.00ms ±0.48ms 1 +0.0%
Switch disabled 0.10ms 0.00ms ±0.32ms 1 +0.0%
Switch custom-colors 0.10ms 0.00ms ±0.32ms 1 +0.0%
Switch on-value-change 0.20ms 0.00ms ±0.42ms 1 +0.0%
Switch with-accessibility 0.20ms 0.00ms ±0.42ms 1 +0.0%
Switch multiple-10 1.67ms 1.00ms ±1.05ms 1 -50.0%
Switch multiple-50 9.00ms 7.00ms ±2.80ms 1 -22.2%
Switch multiple-100 17.40ms 15.00ms ±3.96ms 1 -6.3%

Button

Scenario Mean Median StdDev Renders vs Baseline
Button mount 0.60ms 1.00ms ±0.52ms 1 +0.0%
Button unmount 0.10ms 0.00ms ±0.32ms 0 +0.0%
Button rerender 1.00ms 1.00ms ±0.67ms 2 +0.0%
Button disabled 0.40ms 0.00ms ±0.52ms 1 -100.0%
Button with-color 0.60ms 1.00ms ±0.52ms 1 +100.0%
Button with-accessibility 0.60ms 1.00ms ±0.52ms 1 +0.0%
Button multiple-10 5.87ms 6.00ms ±1.13ms 1 +0.0%
Button multiple-50 21.40ms 24.00ms ±7.81ms 1 -11.1%
Button multiple-100 17.80ms 17.00ms ±2.91ms 1 -10.5%

TextInput

Scenario Mean Median StdDev Renders vs Baseline
TextInput mount 0.20ms 0.00ms ±0.42ms 1 +0.0%
TextInput unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
TextInput rerender 0.20ms 0.00ms ±0.42ms 2 +0.0%
TextInput multiline 0.20ms 0.00ms ±0.42ms 1 +0.0%
TextInput with-value 0.00ms 0.00ms ±0.00ms 1 +0.0%
TextInput styled 0.10ms 0.00ms ±0.32ms 1 +0.0%
TextInput multiple-100 7.27ms 7.00ms ±1.10ms 1 +0.0%

View

Scenario Mean Median StdDev Renders vs Baseline
View mount 0.00ms 0.00ms ±0.00ms 1 +0.0%
View unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
View rerender 0.20ms 0.00ms ±0.42ms 2 +0.0%
View nested-50 3.67ms 3.00ms ±1.54ms 1 +0.0%
View nested-100 7.73ms 7.00ms ±1.44ms 1 +0.0%
View shadow 0.20ms 0.00ms ±0.42ms 1 +0.0%
View border-radius 0.20ms 0.00ms ±0.42ms 1 +0.0%
View nested-500 16.80ms 10.00ms ±12.74ms 1 +0.0%

Text

Scenario Mean Median StdDev Renders vs Baseline
Text mount 0.10ms 0.00ms ±0.32ms 1 +0.0%
Text unmount 0.00ms 0.00ms ±0.00ms 0 +0.0%
Text rerender 0.20ms 0.00ms ±0.42ms 2 +0.0%
Text long-1000 0.10ms 0.00ms ±0.32ms 1 +0.0%
Text nested 0.20ms 0.00ms ±0.42ms 1 +0.0%
Text styled 0.10ms 0.00ms ±0.32ms 1 +0.0%
Text multiple-100 7.93ms 8.00ms ±1.94ms 1 +14.3%

SectionList.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
SectionList native mount 4.24ms 3.97ms ±0.46ms 1 -38.9%

FlatList.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
FlatList native mount 4.56ms 4.50ms ±0.71ms 1 -51.2%

TouchableHighlight.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TouchableHighlight native mount 1.41ms 1.28ms ±0.54ms 1 -38.6%

TouchableOpacity.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TouchableOpacity native mount 1.65ms 1.55ms ±0.23ms 1 -50.5%

Pressable.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Pressable native mount 1.34ms 1.30ms ±0.11ms 1 -48.2%

ScrollView.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
ScrollView native mount 3.14ms 2.84ms ±0.87ms 1 -30.0%

ActivityIndicator.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
ActivityIndicator native mount 1.26ms 1.17ms ±0.23ms 1 -52.9%

TextInput.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
TextInput native mount 1.82ms 1.75ms ±0.20ms 1 -57.2%

Switch.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Switch native mount 1.09ms 1.05ms ±0.18ms 1 -39.7%

Button.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Button native mount 1.81ms 1.59ms ±0.49ms 1 -38.9%

Modal.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Modal native mount 0.89ms 0.83ms ±0.15ms 1 -31.5%

Image.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Image native mount 1.59ms 1.55ms ±0.17ms 1 -31.3%

View.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
View native mount 1.04ms 0.98ms ±0.24ms 1 -31.7%

Text.native-perf-test.ts

Scenario Mean Median StdDev Renders vs Baseline
Text native mount 1.25ms 1.17ms ±0.24ms 1 -32.6%

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