macOS adopted an interesting behaviour some time ago where when you opened a new window in an application. It would default to opening a new tab in the window instead of opening a new window.<\/p>\n\n\n\n
If your application could not deal with this and the user had the preference in System Preferences > Dock > Prefer Tabs when opening documents set to Always<\/em> then it could cause your app issues.<\/p>\n\n\n\n You can opt out of this behaviour in your app’s open event.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" macOS adopted an interesting behaviour some time ago where when you opened a new window in an application. It would default to opening a new tab in the window instead of opening a new window. If your application could not deal with this and the user had the preference in System Preferences > Dock > … <\/p>\nPublic Sub AppAutoTabbing(optIn as boolean)\n #if not TargetMacOS\n #pragma unused optIn\n #endif\n \n #if TargetMacOS\n \n Declare Function NSClassFromString Lib \"Cocoa\" (name As CFStringRef) As Ptr\nDim nsWindowClass As ptr = NSClassFromString( \"NSWindow\" ) \n\nif nsWindowClass = nil then\n \/\/ msgbox CurrentMethodName + \" nsWindowClass is Nil\"\n break\n return\nend if\n\ndeclare sub EnableTabGrouping lib \"AppKit\"selector \"setAllowsAutomaticWindowTabbing:\" ( classPtr as Ptr , enableDisable as Boolean ) \n\nEnableTabGrouping( nsWindowClass, optIn )\n \n #endif\n \nEnd Sub\n<\/code><\/pre>\n\n\n\n