+ Run button is not shown anymore in the Log tab, therefore, you can only run algorithms from the Parameters tab.
+ While running an algorithm, the Parameters tab is now blocked.
+ When an algorithm execution finishes (either successfully or not), a new button Change Parameters is shown in the Log tab.
+ The Batch Algorithm Dialog is now consistent with the described behavior (before, it blocked the Parameters panel, but not the tab; and it was the only dialog blocking parameters widgets).
These changes were applied to the Algorithm Dialog and Batch Algorithm Dialog, and work on Edit in place dialogs as well.
