Merge "Early exit if the target region is empty" into sc-dev am: 47d7cbaf87

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15391846

Change-Id: I4064272d223dfe4c3c732e034fa92c35f1e28eb1

core/java/android/text/TextLine.java

@@ -782,7 +782,7 @@ public class TextLine {
 
         int spanStart = runStart;
         int spanLimit;
-        if (mSpanned == null) {
+        if (mSpanned == null || runStart == runLimit) {
             spanLimit = runLimit;
         } else {
             int target = after ? offset + 1 : offset;