insert and delete rows and columns - AlfonsMittelmeyer/python-gui-messaging GitHub Wiki
Insert and delete row and columns
When the button above the label 'Columns' is pressed, the grid bar view appears.
When the mouse pointer is over such a bar, the bar becomes green.
After clicking on this bar, it becomes blue
The blue color shows the insert and delete mode.
Pressing the [Insert] key inserts a row or column.
Pressing the [Delete] key deletes a row or column, but only if there is no widget with grid layout inside.
The insert and delete mode ends, when the mouse pointer enters another bar or when once more the bar is clicked.