Allow breaks before member access dots.

Sources/SwiftFormatPrettyPrint/TokenStreamCreator.swift

@@ -595,6 +595,7 @@ private final class TokenStreamCreator: SyntaxVisitor {
   }
 
   func visit(_ node: MemberAccessExprSyntax) -> SyntaxVisitorContinueKind {
+    before(node.dot, tokens: .break(.continue, size: 0))
     return .visitChildren
   }
 

Tests/SwiftFormatPrettyPrintTests/MemberAccessExprTests.swift

@@ -0,0 +1,23 @@
+public class MemberAccessExprTests: PrettyPrintTestCase {
+  public func testMemberAccess() {
+    let input =
+      """
+      let a = one.two.three.four.five
+      let b = (c as TypeD).one.two.three.four
+      """
+
+    let expected =
+      """
+      let a = one.two
+        .three.four
+        .five
+      let b = (
+        c as TypeD
+      ).one.two.three
+        .four
+
+      """
+
+    assertPrettyPrintEqual(input: input, expected: expected, linelength: 15)
+  }
+}

Tests/SwiftFormatPrettyPrintTests/XCTestManifests.swift

@@ -287,6 +287,15 @@ extension InitializerDeclTests {
     ]
 }
 
+extension MemberAccessExprTests {
+    // DO NOT MODIFY: This is autogenerated, use:
+    //   `swift test --generate-linuxmain`
+    // to regenerate.
+    static let __allTests__MemberAccessExprTests = [
+        ("testMemberAccess", testMemberAccess),
+    ]
+}
+
 extension NewlineTests {
     // DO NOT MODIFY: This is autogenerated, use:
     //   `swift test --generate-linuxmain`
@@ -492,6 +501,7 @@ public func __allTests() -> [XCTestCaseEntry] {
         testCase(IfStmtTests.__allTests__IfStmtTests),
         testCase(ImportTests.__allTests__ImportTests),
         testCase(InitializerDeclTests.__allTests__InitializerDeclTests),
+        testCase(MemberAccessExprTests.__allTests__MemberAccessExprTests),
         testCase(NewlineTests.__allTests__NewlineTests),
         testCase(ProtocolDeclTests.__allTests__ProtocolDeclTests),
         testCase(RepeatStmtTests.__allTests__RepeatStmtTests),