Switch to a consistent vertical pipe character for nested diagnostics

Author: DougGregor

Sources/SwiftDiagnostics/GroupedDiagnostics.swift

@@ -151,7 +151,7 @@ extension GroupedDiagnostics {
       let childSource = annotateSource(
         childBufferID,
         formatter: formatter,
-        indentString: indentString + String(repeating: " ", count: childPadding) + "|"
+        indentString: indentString + String(repeating: " ", count: childPadding) + "│"
       )
 
       return (sourceFiles[childBufferID.id].parent!.1, childSource)

Tests/SwiftDiagnosticsTest/GroupDiagnosticsFormatterTests.swift

@@ -116,12 +116,12 @@ final class GroupedDiagnosticsFormatterTests: XCTestCase {
       2 │ #myAssert(pi == 3)
         ∣ ╰─ in expansion of macro 'myAssert' here
         ╭-── #myAssert────────────────────────────────────────────────────────
-        |1 │ let __a = pi
-        |2 │ let __b = 3
-        |3 │ if !(__a == __b) {
-        |  ∣          ╰─ no matching operator '==' for types 'Double' and 'Int'
-        |4 │   fatalError("assertion failed: pi != 3")
-        |5 │ }
+        │1 │ let __a = pi
+        │2 │ let __b = 3
+        │3 │ if !(__a == __b) {
+        │  ∣          ╰─ no matching operator '==' for types 'Double' and 'Int'
+        │4 │   fatalError("assertion failed: pi != 3")
+        │5 │ }
         ╰-────────────────────────────────────────────────────────────────────
       3 │ print("hello"
         ∣              ╰─ expected ')' to end function call
@@ -185,16 +185,16 @@ final class GroupedDiagnosticsFormatterTests: XCTestCase {
       2 │ #myAssert(pi == 3)
         ∣ ╰─ in expansion of macro 'myAssert' here
         ╭-── #myAssert────────────────────────────────────────────────────────
-        |1 │ let __a = pi
-        |2 │ let __b = 3
-        |3 │ if #invertedEqualityCheck(__a, __b) {
-        |  ∣    ╰─ in expansion of macro 'invertedEqualityCheck' here
-        |  ╭-── #invertedEqualityCheck────────────────────────────────────────
-        |  |1 │ !(__a == __b)
-        |  |  ∣       ╰─ no matching operator '==' for types 'Double' and 'Int'
-        |  ╰-─────────────────────────────────────────────────────────────────
-        |4 │   fatalError("assertion failed: pi != 3")
-        |5 │ }
+        │1 │ let __a = pi
+        │2 │ let __b = 3
+        │3 │ if #invertedEqualityCheck(__a, __b) {
+        │  ∣    ╰─ in expansion of macro 'invertedEqualityCheck' here
+        │  ╭-── #invertedEqualityCheck────────────────────────────────────────
+        │  │1 │ !(__a == __b)
+        │  │  ∣       ╰─ no matching operator '==' for types 'Double' and 'Int'
+        │  ╰-─────────────────────────────────────────────────────────────────
+        │4 │   fatalError("assertion failed: pi != 3")
+        │5 │ }
         ╰-────────────────────────────────────────────────────────────────────
       3 │ print("hello"
         ∣              ╰─ expected ')' to end function call