fix(w-div): scan a className on any whitespace, not a single space - #180
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`.claude/rules/widgets.md` and SKILL.md both instruct a className covering
3+ concerns to be a triple-quoted string with one concern per line. Three of
WDiv's token scans split on a single space, so a token ending a line arrived
as `flex-1\n` and never matched. The style guide was steering callers into
the defect.
Two reproduced consequences:
- `_selfWrapsInFlex` missed the token, so the row wrapped a child that
already carried its own Expanded and threw "Incorrect use of
ParentDataWidget".
- `_hasShrinkZero` missed it, so a `w-24 shrink-0` child in a 100pt row
shrank to its 50pt flex share instead of holding 96.
`_hasExplicitCrossWidth` is corrected for consistency with its own documented
"in ANY state or breakpoint variant" intent, but no observable failure could
be produced for it: a stretched column child still renders at the width it
asked for, so the miss costs a redundant wrapper rather than a wrong layout.
It gets no test, because a test that passes before the fix pins nothing.
All five scans now share one hoisted `_whitespaceRegex`, which also stops the
two that already split on whitespace from allocating a `RegExp` per call
inside the composition path.
📝 WalkthroughWalkthrough
ChangesMultiline className parsing
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The PR fixes multiline className token detection and adds regression coverage for the affected flex behaviors. It is mergeable with owner follow-up to correct the changelog wording so the release note accurately describes the behavior change. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@CHANGELOG.md`:
- Line 13: Correct the `_hasExplicitCrossWidth` portion of the changelog to
describe the change as tokenization consistency only; remove any claim that it
fixed explicit-width behavior or an observable layout failure. Keep the release
note focused on sharing whitespace-based tokenization across the scans, and
retain the required changelog entry for the behavior-changing source updates.
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📒 Files selected for processing (3)
CHANGELOG.mdlib/src/widgets/w_div.darttest/widgets/w_div/multiline_classname_test.dart
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@kodizm review |
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Note Kodizm (AI-generated). May contain mistakes; verify before acting. The fix is correct and tightly scoped: the three helpers that split on I grepped every Minor
TestsBoth new cases are the right shape — Checks I ran
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Resolves the CHANGELOG conflict: master's `### Fixed` bullet and this branch's two sit at the same position, and master also carries the whole `### Quality` section. All three Fixed bullets now sit under Fixed, master's first because it landed first, with Quality kept last. No wording changed on either side. This is the first build combining #180's whitespace token scan with the semantics changes here, so the full gate ran rather than the workflow-only subset: 1706 tests passed, 1 skipped, coverage 94.8%.
…entry (#183) The entry said the trailing newline caused a "miss" at that site whose cost was a redundant wrapper. There was no miss. `_hasExplicitCrossWidth` matches with `startsWith('w-')` rather than equality, and `'w-24\n'.startsWith('w-')` is true, so a newline never hid an explicit width from it. That also corrects the reasoning, not just the wording. The test written for that site passed before the fix because the predicate already worked, not because the consequence was unobservable, which is what the entry implied and what I had concluded. CodeRabbit raised this on #180 and I read its finding as claiming the entry asserted a behavioural fix, which it did not, so the thread closed with the mechanism agreed and this sentence left standing. Correcting it before it ships in the 1.4.1 release notes.
1 participant
What
WDiv's token scans split a child's rawclassNameon any whitespace instead of a single space.Why
The project's own style guide is what put the bug in reach.
.claude/rules/widgets.mdandSKILL.md(sections 7 and 10) both instruct a className covering 3+ concerns to be a triple-quoted string with one concern per line:Three composition helpers split that on
' ', soflex-1at the end of a line arrives asflex-1\nand never matches. The guidance was correct; the implementation could not honour it.Two consequences, both reproduced before fixing:
_selfWrapsInFlexflex-1child in aflex flex-row overflow-hiddenrowIncorrect use of ParentDataWidget(the child already carried its ownExpanded, the row wrapped it again)_hasShrinkZerow-24 shrink-0child in a crowded 100pt rowBoth are pinned by
test/widgets/w_div/multiline_classname_test.dart, which fails onmaster.The third site, and why it has no test
_hasExplicitCrossWidthhas the same miss and is corrected for consistency with its own documented "in ANY state or breakpoint variant" intent. I could not produce an observable failure for it: a column child that gets stretched still renders at the width it asked for, because its ownw-24wins inside the stretch wrapper. So the cost is a redundant wrapper in the tree, not a wrong layout. I wrote the test, watched it pass onmaster, and deleted it. A test that passes before the fix pins nothing, and keeping it would have implied a regression it does not guard.While in there
All five token scans now share one hoisted
static final RegExp _whitespaceRegex, matching the existing_numericFlexRegexfield. Two of them (_hasBareFullWidth,_claimsGrowShare) already split on whitespace but constructedRegExp(r'\s+')on every call, inside the row/column composition path.Gates
dart format --set-exit-if-changed: 0 changed.dart analyze lib/ test/ example/lib/: No issues found../tool/coverage.sh 90: 1700 passed, 1 skipped, coverage 94.8%.python3 tool/check-docs.py: 0 issues across 72 doc pages.Post-change sync
CHANGELOG.mdonly. Nodoc/or skill change: nothing there stated the wrong behaviour, and the guidance that led into the bug is the guidance this fix makes safe, so amending it would be noise. No README change (no roster change) and no example page (no new token).Summary by CodeRabbit
Bug Fixes
classNameparsing so layout classes work correctly when separated by newlines or other whitespace.shrink-0sizing, and explicit cross-width behavior.Tests