1. Open file "test/_common_data/scenarios/msa/ma.aln".
2. Select all the alignment.
3. Drag & drop it to the right
Expected state: the alignment has been shifted to the right, no trailing gaps have shown up.
Current state: the alignment has been shifted to the right, and several gap columns have been added at the end of it. The number of gap columns depends on how quickly the alignment has been shifted.
After the issue has been fixed, please, recover GUITest_regression_scenarios_test_2160.