Gregory's Server@raymccarthy @april Bruce Horn claims that many major GUI elements were invented by Apple after seeing Smalltalk, including drag-and-drop file manipulation, menu bar and pull-down menus, clipboard, “self-repairing” windows, and others. https://www.folklore.org/StoryView.py?story=On_Xerox%2C_Apple_and_Progress.txt has details.
@mariani1 @april Developed or enhanced, not invented. Software shouldn't be patentable, nor regarded as invention. Copyright is sufficient, if required.