Bug 1283915 - Preserve input selection properties after type change. r=smaug

MozReview-Commit-ID: 7xJKc3vIpTY

dom/html/HTMLInputElement.cpp

@@ -4826,12 +4826,22 @@ HTMLInputElement::HandleTypeChange(uint8_t aNewType)
     GetValue(aOldValue);
   }
 
+  nsTextEditorState::SelectionProperties sp;
+
+  if (GetEditorState()) {
+    sp = mInputData.mState->GetSelectionProperties();
+  }
+
   // We already have a copy of the value, lets free it and changes the type.
   FreeData();
   mType = aNewType;
 
   if (IsSingleLineTextControl()) {
+
     mInputData.mState = new nsTextEditorState(this);
+    if (!sp.IsDefault()) {
+      mInputData.mState->SetSelectionProperties(sp);
+    }
   }
 
   /**