[Brief]
Revision selection by check the checkbox should NOT be canceled by click other area
[Detail]
I want to select some revisions for merge.
First, I select one rev by left click the checkbox. Then I right click another revision for context-menu, because I want to view the change detail.
The revision I selected is unchecked.
What's more, when I checked a lot of revisions, and I want to add one rev more. By accident, I didn't click accurately on the checkbox. ALL the selections are gone.
It makes trouble.