Rule-based formatting is not applied when using offsets starting at 1 or greater

[3dsnm]

When swift-format is run with an offset range starting at 1 or greater, the formatter applies general formatting but does not apply any rule-based formatting.

Example

.swift-format:

{
  "rules": {
    "NoParensAroundConditions": true,
    "DoNotUseSemicolons": true
  }
}

input:

/// Some String....
 if (a = 0) {             NSLog("print: \(a)");}

Environment variable for convenience:

export CODE="/// Some String....\n if (a = 0) {             NSLog(\"print: \\(a)\");}"

And expected result:

/// Some String....
if a = 0 { NSLog("print: \(a)") }

---

These commands produce the expected result:

echo $CODE | swift-format format - --configuration .swift-format
echo $CODE | swift-format format - --configuration .swift-format --offsets 0:999

But the following commands do not:

echo $CODE | swift-format format - --configuration .swift-format --offsets 1:999
echo $CODE | swift-format format - --configuration .swift-format --offsets 0:1 --offsets 1:999

Actual output:

/// Some String....
if (a = 0) { NSLog("print: \(a)");  }

Although the sliced input beginning at offset 1 still forms valid Swift syntax (// Some String....), rule-based formatting are not applied, while other non-rule formatting is applied correctly.