ecbb77c558
Makes it possible to swipe over panel header to batch open/collapse all panels the mouse draged over. Normal panels and sub-panels support this too. Two changes were needed: - Support "drag toggle" feature for `UI_BTYPE_BUT_TOGGLE` - all toggle buttons should/can support this. - Allow querying the pushed state from the button used for the collapsing. Multiple ways to do this, in this case simply using the pushed state query callback seemed simplest. Pull Request: https://projects.blender.org/blender/blender/pulls/114560