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Description
Try out the following codesnippet with clang-format 20.1.7 and the following clang-format file:
---
DisableFormat: true
AccessModifierOffset: -4
AlignAfterOpenBracket: Align
AlignConsecutiveAssignments: false
AlignConsecutiveDeclarations: false
AlignConsecutiveMacros:
Enabled: true
AcrossEmptyLines: true
AcrossComments: false
AlignEscapedNewlines: Left
AlignOperands: true
AlignTrailingComments: true
AllowAllArgumentsOnNextLine: false
AllowAllConstructorInitializersOnNextLine: false
AllowAllParametersOfDeclarationOnNextLine: false
AllowShortBlocksOnASingleLine: Never
AllowShortCaseLabelsOnASingleLine: false
AllowShortFunctionsOnASingleLine: Empty
AllowShortLambdasOnASingleLine: All
AllowShortIfStatementsOnASingleLine: Never
AllowShortLoopsOnASingleLine: false
AlwaysBreakAfterDefinitionReturnType: None
AlwaysBreakAfterReturnType: None
AlwaysBreakBeforeMultilineStrings: false
AlwaysBreakTemplateDeclarations: Yes
BinPackArguments: false
BinPackParameters: false
BreakBeforeBinaryOperators: NonAssignment
BreakBeforeBraces: Allman
BreakBeforeInheritanceComma: false
BreakBeforeTernaryOperators: true
BreakConstructorInitializers: BeforeComma
BreakInheritanceList: BeforeComma
BreakStringLiterals: true
ColumnLimit: 120
BreakAfterAttributes: Always
CompactNamespaces: false
ConstructorInitializerAllOnOneLineOrOnePerLine: false
ConstructorInitializerIndentWidth: 4
ContinuationIndentWidth: 4
Cpp11BracedListStyle: true
DerivePointerAlignment: false
ExperimentalAutoDetectBinPacking: false
FixNamespaceComments: true
IncludeBlocks: Preserve
IndentCaseLabels: false
IndentGotoLabels: false
IndentPPDirectives: None
IndentWidth: 4
IndentWrappedFunctionNames: false
InsertNewlineAtEOF: true
KeepEmptyLinesAtTheStartOfBlocks: false
MaxEmptyLinesToKeep: 1
NamespaceIndentation: All
PointerAlignment: Left
ReflowComments: true
SortIncludes: false
PenaltyBreakBeforeFirstCallParameter: 1000
SortUsingDeclarations: false
SpaceAfterCStyleCast: false
SpaceAfterLogicalNot: false
SpaceAfterTemplateKeyword: true
SpaceBeforeAssignmentOperators: true
SpaceBeforeCpp11BracedList: false
SpaceBeforeCtorInitializerColon: true
SpaceBeforeInheritanceColon: true
SpaceBeforeParens: ControlStatements
SpaceBeforeRangeBasedForLoopColon: true
SpaceBeforeSquareBrackets: false
SpaceInEmptyBlock: false
SpaceInEmptyParentheses: false
SpacesBeforeTrailingComments: 1
SpacesInAngles: false
SpacesInCStyleCastParentheses: false
SpacesInConditionalStatement: false
SpacesInContainerLiterals: true
SpacesInParentheses: false
SpacesInSquareBrackets: false
Standard: Latest
StatementMacros: ["TEST_CLASS", "TEST_METHOD"]
UseTab: Never
UseCRLF: false
WrapNamespaceBodyWithEmptyLines: Never
---
Language: Cpp
DisableFormat: false
Then the following comment is not idempotent:
//
//a \
//b
//After formatting it, the "a" in the second line walks one space to the right. This can be repeated arbitrarily often.