Thank you for reporting this bug. We will make it our priority to review this report.
GroupSummaryView, GridRowEditing, and ComboBox
Could you also take a look on this situation ?:
There is a grid with GroupSummaryView and GridRowEditing. Suppose sumarry is based on value edited with ComboBox. When in edit mode you change value of this combo the selected value is applied to all rows in this group. The same situation in IE and FF browsers.
Sencha - GXT Dev Team
@Jarema Please do not report multiple bugs in a thread. If you think there is a bug with grouping and editing please submit a new thread and include the details of the bug including a test case. Thanks.
I've split your thread to separate out this issue.