Update wpkit_summarized to do the same

Author: kean

Modules/Sources/WordPressKitModels/NSString+Summary.swift

@@ -17,6 +17,7 @@ extension NSString {
         let characterSet = CharacterSet(charactersIn: "\n")
 
         return (self as String).strippingGutenbergContentForExcerpt()
+            .replacingOccurrences(of: "<br\\s*/?>", with: " ", options: .regularExpression)
             .strippingShortcodes()
             .makePlainText()
             .trimmingCharacters(in: characterSet)

Modules/Sources/WordPressShared/Utility/GutenbergExcerptGenerator.swift

@@ -16,7 +16,7 @@ public struct GutenbergExcerptGenerator {
 
         // Extract content while convering  <br>, <br/>, <br /> to newlines first
         let rawText = String(content[tagEnd.upperBound..<pEnd.lowerBound])
-            .replacingOccurrences(of: "<br\\s*/?>", with: "\n", options: .regularExpression)
+            .replacingOccurrences(of: "<br\\s*/?>", with: " ", options: .regularExpression)
 
         // Remove HTML tags AND shortcodes in one pass
         let range = NSRange(rawText.startIndex..., in: rawText)