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Original PR/Discussion: https://github.com/flutter/flutter/pull/172915 # Framework: * `EditableText`/`SelectableText`, applies `lineHeightScaleFactorOverride`, `wordSpacingOverride`, and `letterSpacingOverride` to it's `TextStyle` similarly to how we already do for bold platform overrides. Note `SelectableText` is built on `EditableText` so it also applies these overrides. * `Text`, applies `lineHeightScaleFactorOverride`, `wordSpacingOverride`, and `letterSpacingOverride` to it's `TextStyle` similarly to how we already do for bold platform overrides. * Exposes line height override through `MediaQueryData.lineHeightScaleFactorOverride` and `maybeLineHeightScaleFactorOverrideOf(context)`. * Exposes letter spacing override through `MediaQueryData.letterSpacingOverride` and `maybeLetterSpacingOverrideOf(context)`. * Exposes word spacing override through `MediaQueryData.wordSpacingOverride` and `maybeWordSpacingOverrideOf(context)`. * Exposes paragraph spacing override through `MediaQueryData.paragraphSpacingOverride` and `maybeParagraphSpacingOverrideOf(context)`. * `MediaQuery.applyTextStyleOverrides()` \ `MediaQueryData.applyTextStyleOverrides()` to be able to reset/override the text spacing settings on `MediaQueryData`. # Engine: * Introduces new members on `PlatformDispatcher` API that hold the text spacing properties that are overridden on the web. * We provide the `lineHeightScaleFactorOverride`, `letterSpacingOverride`, `wordSpacingOverride`, and `paragraphSpacingOverride` on the web by attaching a `ResizeObserver` to an off-screen hidden element, when its size changes we capture its text spacing CSS properties, and notify the framework through `onMetricsChanged`. Fixes #142712 https://github.com/user-attachments/assets/aaaa3e74-c232-4956-acd2-ae1a4487e415 ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. --------- Co-authored-by: Renzo Olivares <roliv@google.com>
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