Triple tap selection should not move beyond text boundary at the tapped location (#132357)
This PR makes sure we do not select beyond the text boundary at the tapped position unless, we tap at the end of the text which in that case we should select the previous text boundary.
```dart
// if x is a boundary defined by `textBoundary`, most textBoundaries (except
// LineBreaker) guarantees `x == textBoundary.getLeadingTextBoundaryAt(x)`.
// Use x - 1 here to make sure we don't get stuck at the fixed point x.
final int start = textBoundary.getLeadingTextBoundaryAt(extent.offset - 1) ?? 0;
```
This was originally carried over from https://github.com/flutter/flutter/blob/f468f3366c26a5092eb964a230ce7892fda8f2f8/packages/flutter/lib/src/widgets/editable_text.dart#L4167-L4179 which used this `x - 1` to be able to move to the previous word boundary when navigating with a keyboard. When selecting by tapping/clicking we do not want to move past the text boundary at the tapped position so this adjustment is not needed.
Fixes #132126
https://dart.googlesource.com/external/github.com/flutter/flutter/+/0e15ab54d1b05e8f21153180a4719056127c0e8e
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With depot_tools installed and on your path, create a directory for your monorepo checkout and run these commands to create a gclient solution in that directory:
mkdir monorepo cd monorepo gclient config --unmanaged https://dart.googlesource.com/monorepo gclient sync -D
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goma_ctl ensure_start is sufficient.Example build commands that work on linux:
MONOREPO_PATH=$PWD if [[ ! $PATH =~ (^|:)$MONOREPO_PATH/flutter/bin(:|$) ]]; then PATH=$MONOREPO_PATH/flutter/bin:$PATH fi export GOMA_DIR=$(dirname $(command -v gclient))/.cipd_bin goma_ctl ensure_start pushd engine/src flutter/tools/gn --goma --no-prebuilt-dart-sdk --unoptimized --full-dart-sdk autoninja -C out/host_debug_unopt popd
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MONOREPO_PATH=$PWD cd flutter/examples/layers flutter --local-engine=host_debug_unopt \ -d chrome run widgets/spinning_square.dart cd $MONOREPO_PATH
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MONOREPO_PATH=$PWD cd flutter/packages/flutter flutter test --local-engine=host_debug_unopt cd $MONOREPO_PATH
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