[Mac] Preserve original selection when suggesting completions with diacritics

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h
index dc284b4e0df63aae835b2ebac101746a4902a322..0b90b85a6acbce5d876c808b4be05039e27e1bfe 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h
@@ -39,6 +39,10 @@ class AutocompleteTextFieldObserver;
 
   // Indicates if the text has been changed by key events.
   BOOL textChangedByKeyEvents_;
+
+  // The selected range as far as NSTextView is concerned.
+  // See |actualSelectedRange|.
+  NSRange visualSelectedRange_;
 }
 
 // The delegate is always an AutocompleteTextField*.  Override the superclass
@@ -50,6 +54,12 @@ class AutocompleteTextFieldObserver;
 // storage object.
 - (void)setAttributedString:(NSAttributedString*)aString;
 
+// Stores requested selection range, before it's adjusted to grapheme
+// boundaries. This range is what text editing commands
+// will operate on, vs. |visualSelectionRange_|, which reflects the
+// range that looks highlighted.
+@property(nonatomic, readonly) NSRange actualSelectedRange;
+
 @end
 
 @interface AutocompleteTextFieldEditor(PrivateTestMethods)