Fixed line splitting in text area windows.

Unity's labels can only display a limit number of characters so the
text area window splits text into multiple label elements.  The splitting
was not taking into account line breaks so text would be split at very
odd boundaries making things harder to read.  This changes the line
splitting to preferably occur on line breaks.

Change-Id: I59d8fc897856da336df19a3324da313fb670b240

Author: Stewart Miles

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Android Resolver: Fixed resolution window progress bar exceeding 100%.
 * Android Resolver: If AndroidX is detected in the set of resolved libraries,
   the user will be prompted to enable the Jetifier.
+* Android Resolver: Improved text splitting in text area windows.
 * iOS Resolver: Added support for Unity's breaking changes to the Xcode API
   in 2019.3.+. Cocoapods are now added to build targets, Unity-iPhone and
   UnityFramework in Unity 2019.3+.

source/PlayServicesResolver/src/TextAreaDialog.cs

@@ -168,10 +168,10 @@ protected virtual void OnGUI()
             const int chunkSize = 5000;  // Conservative chunk size < 65k characters.
             while (bodyTextOffset < bodyText.Length)
             {
-                int readSize = chunkSize;
-                readSize = bodyTextOffset + readSize >= bodyText.Length ?
-                    bodyText.Length - bodyTextOffset : readSize;
-                bodyTextList.Add(bodyText.Substring(bodyTextOffset, readSize));
+                int searchSize = Math.Min(bodyText.Length - bodyTextOffset, chunkSize);
+                int readSize = bodyText.LastIndexOf("\n", bodyTextOffset + searchSize, searchSize);
+                readSize = readSize >= 0 ? readSize - bodyTextOffset + 1 : searchSize;
+                bodyTextList.Add(bodyText.Substring(bodyTextOffset, readSize).TrimEnd());
                 bodyTextOffset += readSize;
             }
             foreach (string bodyTextChunk in bodyTextList)