update view cursor when selecting new line in patch explorer view

vendor/github.com/jesseduffield/gocui/gui.go

@@ -1226,8 +1226,10 @@ func (g *Gui) onKey(ev *GocuiEvent) error {
 				newCx = lastCharForLine
 			}
 		}
-		if err := v.SetCursor(newCx, newCy); err != nil {
-			return err
+		if !IsMouseScrollKey(ev.Key) {
+			if err := v.SetCursor(newCx, newCy); err != nil {
+				return err
+			}
 		}
 
 		if IsMouseKey(ev.Key) {
@@ -1289,6 +1291,19 @@ func IsMouseKey(key interface{}) bool {
 	}
 }
 
+func IsMouseScrollKey(key interface{}) bool {
+	switch key {
+	case
+		MouseWheelUp,
+		MouseWheelDown,
+		MouseWheelLeft,
+		MouseWheelRight:
+		return true
+	default:
+		return false
+	}
+}
+
 // execKeybindings executes the keybinding handlers that match the passed view
 // and event. The value of matched is true if there is a match and no errors.
 func (g *Gui) execKeybindings(v *View, ev *GocuiEvent) (matched bool, err error) {