this time the correct clang-format has been used

.clang-format

@@ -71,7 +71,7 @@ IncludeCategories:
 IncludeIsMainRegex: '(Test)?$'
 IndentCaseLabels: false
 IndentPPDirectives: None
-IndentWidth:     2
+IndentWidth:     4
 IndentWrappedFunctionNames: false
 JavaScriptQuotes: Leave
 JavaScriptWrapImports: true
@@ -116,6 +116,6 @@ StatementMacros:
   - Q_UNUSED
   - QT_REQUIRE_VERSION
 TabWidth:        4
-UseTab:          ForIndentation
+UseTab:          ForContinuationAndIndentation
 ...
 

source/error.h

@@ -45,7 +45,9 @@ public:
 
 	bool isValue() const { return std::holds_alternative<T>(value_or_error); }
 
-  bool isError() const { return std::holds_alternative<Error>(value_or_error); }
+	bool isError() const {
+		return std::holds_alternative<Error>(value_or_error);
+	}
 
 	const Error &error() const { return std::get<Error>(value_or_error); }