Drop events are actually enabled by default.

Nabile-Rahmani · flibitijibibo · commit eeadbf0709eb · 2019-10-22T07:52:33.000-04:00
diff --git a/src/SDL2.cs b/src/SDL2.cs
@@ -4355,7 +4355,7 @@ public struct SDL_DollarGestureEvent
 			public float y;
 		}
 
-		/* File open request by system (event.drop.*), disabled by
+		/* File open request by system (event.drop.*), enabled by
 		 * default
 		 */
 		[StructLayout(LayoutKind.Sequential)]

Original file line number	Diff line number	Diff line change
`@@ -4355,7 +4355,7 @@ public struct SDL_DollarGestureEvent`
`4355`	`4355`	`public float y;`
`4356`	`4356`	`}`
`4357`	`4357`
`4358`		`- /* File open request by system (event.drop.*), disabled by`
	`4358`	`+ /* File open request by system (event.drop.*), enabled by`
`4359`	`4359`	`* default`
`4360`	`4360`	`*/`
`4361`	`4361`	`[StructLayout(LayoutKind.Sequential)]`