MPS-20027 Attribute access doesn't delete after first press on backspace button
MPS-20036 can't input *=
MPS-20027 Attribute access doesn't delete after first press on backspace button
- adding unit-tests
MPS-20027 Attribute access doesn't delete after first press on backspace button
- registering new unit-tests
regenerating sources
Merge remote-tracking branch 'origin/MPS3.1' into 3.1/editorUsability