apply new line break logic to links and images

Author: QuietMisdreavus

Sources/Markdown/Walker/Walkers/MarkupFormatter.swift

@@ -805,7 +805,7 @@ public struct MarkupFormatter: MarkupWalker {
         // Image elements' source URLs can't be split. If wrapping the alt text
         // of an image still put us over the line, prefer to print it on the
         // next line to give as much opportunity to keep the alt text contents on one line.
-        if image.indexInParent > 0 && (isOverPreferredLineLimit || state.lineNumber > savedState.lineNumber) {
+        if image.indexInParent > 0 && (isOverPreferredLineLimit || state.effectiveLineNumber > savedState.effectiveLineNumber) {
             restoreState(to: savedState)
             queueNewline()
             printImage()
@@ -842,7 +842,7 @@ public struct MarkupFormatter: MarkupWalker {
             // Link elements' destination URLs can't be split. If wrapping the link text
             // of a link still put us over the line, prefer to print it on the
             // next line to give as much opportunity to keep the link text contents on one line.
-            if link.indexInParent > 0 && (isOverPreferredLineLimit || state.lineNumber > savedState.lineNumber) {
+            if link.indexInParent > 0 && (isOverPreferredLineLimit || state.effectiveLineNumber > savedState.effectiveLineNumber) {
                 restoreState(to: savedState)
                 queueNewline()
                 printRegularLink()

Tests/MarkdownTests/Visitors/MarkupFormatterTests.swift

@@ -708,6 +708,42 @@ class MarkupFormatterSimpleRoundTripTests: XCTestCase {
         checkCharacterEquivalence(for: source)
     }
 
+    func testRoundTripHardBreakWithImage() {
+        let source = """
+        This is some text.\("  ")
+        ![This is an image.](image.png "")
+        """
+        checkRoundTrip(for: source)
+        checkCharacterEquivalence(for: source)
+    }
+
+    func testRoundTripSoftBreakWithImage() {
+        let source = """
+        This is some text.
+        ![This is an image.](image.png "")
+        """
+        checkRoundTrip(for: source)
+        checkCharacterEquivalence(for: source)
+    }
+
+    func testRoundTripHardBreakWithLink() {
+        let source = """
+        This is some text.\("  ")
+        [This is a link.](https://swift.org)
+        """
+        checkRoundTrip(for: source)
+        checkCharacterEquivalence(for: source)
+    }
+
+    func testRoundTripSoftBreakWithLink() {
+        let source = """
+        This is some text.
+        [This is a link.](https://swift.org)
+        """
+        checkRoundTrip(for: source)
+        checkCharacterEquivalence(for: source)
+    }
+
     /// Why not?
     func testRoundTripReadMe() throws {
         let readMeURL = URL(fileURLWithPath: #file)