Omit calls to set composing region when pasting image.

content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java

Index: content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java b/content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java
index 75c8bd841deba1ddb41d9b5db317a682e308232b..7afd1a184d71f78acd481210613144bec9d39e7a 100644
--- a/content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java
+++ b/content/public/android/java/src/org/chromium/content/browser/input/AdapterInputConnection.java
@@ -488,17 +488,26 @@ public class AdapterInputConnection extends BaseInputConnection {
         if (a > textLength) a = textLength;
         if (b > textLength) b = textLength;
 
+        CharSequence regionText = null;
         if (a == b) {
             removeComposingSpans(mEditable);
         } else {
+            if (a == 0 && b == mEditable.length()) {
+                regionText = mEditable.subSequence(a, b);
+                // If setting composing region that matches, at least in length, of the entire
+                // editable region then check it for image placeholders.  If any are found,
+                // don't continue this operation.
+                // This fixes the problem where, on Android 4.3, pasting an image is followed

[aurimas (slooooooooow), 2015/05/27 20:28:13]

What does keyboard do if we do not set the composing region?

[bcwhite, 2015/05/28 11:18:15]

I can find no difference in the behavior of the keyboard but I'll ask Sam if he
can try it with Asian keyboards.  Lollipop doesn't even make this call.

+                // by setting the composing region which then causes the image to be deleted.
+                // http://crbug.com/466755
+                for (int i = a; i < b; ++i) {
+                    if (regionText.charAt(i) == '\uFFFC') return true;
+                }
+            }
             super.setComposingRegion(a, b);
         }
         updateSelectionIfRequired();
 
-        CharSequence regionText = null;
-        if (b > a) {
-            regionText = mEditable.subSequence(a, b);
-        }
         return mImeAdapter.setComposingRegion(regionText, a, b);
     }