... happens to be over, regardless of whether that window has focus or whether some other window is showing modal. Except in the case of child windows, where the wheel events now go always to the parent window, and there doesn't seem to be any way for a child window to receive wheel events. What does this mean in Templot? Generally it means that you can zoom the trackpad on the mouse wheel in situations where previously you could not. For example after using the make transition function you will see this dialog: 2_181744_220000000.png Previously, because this dialog shows modal*, it was necessary to use the zoom and pan buttons on this dialog if needed to see the transition curve. That is still the case for the pan buttons, but now in Windows10 you can zoom the trackpad behind this dialog simply by moving the mouse over the trackpad and rolling the mouse wheel. However, I can't remove the zoom buttons because they are still needed in Windows7, and on Wine/CrossOver. There are now some situations where the new behaviour is not ...