Prevent dragging with secondary mouse button

internal/driver/glfw/window.go

@@ -628,7 +628,7 @@ func (w *window) mouseMoved(viewport *glfw.Window, xpos float64, ypos float64) {
 		}
 	}
 
-	if mouseButton != 0 && !mouseDragStarted {
+	if mouseButton != 0 && mouseButton != desktop.MouseButtonSecondary && !mouseDragStarted {
 		obj, pos, _ := w.findObjectAtPositionMatching(w.canvas, previousPos, func(object fyne.CanvasObject) bool {
 			_, ok := object.(fyne.Draggable)
 			return ok
@@ -687,7 +687,7 @@ func (w *window) mouseMoved(viewport *glfw.Window, xpos float64, ypos float64) {
 	mouseDraggedOffset := w.mouseDraggedOffset
 	mouseDragPos := w.mouseDragPos
 	w.mouseLock.RUnlock()
-	if mouseDragged != nil && mouseButton > 0 {
+	if mouseDragged != nil && mouseButton > 0 && mouseButton != desktop.MouseButtonSecondary {
 		draggedObjDelta := mouseDraggedObjStart.Subtract(mouseDragged.(fyne.CanvasObject).Position())
 		ev := new(fyne.DragEvent)
 		ev.AbsolutePosition = mousePos

internal/driver/glfw/window_test.go

@@ -325,6 +325,30 @@ func TestWindow_HandleDragging(t *testing.T) {
 	assert.Nil(t, d1.popDragEvent())
 	assert.Nil(t, d2.popDragEvent())
 
+	// no drag event on secondary mouseDown
+	w.mouseClicked(w.viewport, glfw.MouseButton2, glfw.Press, 0)
+	w.WaitForEvents()
+	assert.Nil(t, d1.popDragEvent())
+	assert.Nil(t, d2.popDragEvent())
+
+	// no drag start and no drag event with pressed secondary mouse button
+	w.mouseMoved(w.viewport, 8, 8)
+	w.WaitForEvents()
+	assert.Nil(t, d1.popDragEvent())
+	assert.Nil(t, d2.popDragEvent())
+
+	// no drag end event on secondary mouseUp
+	w.mouseClicked(w.viewport, glfw.MouseButton2, glfw.Release, 0)
+	w.WaitForEvents()
+	assert.Nil(t, d1.popDragEndEvent())
+	assert.Nil(t, d2.popDragEndEvent())
+
+	// no drag event in simple move
+	w.mouseMoved(w.viewport, 9, 9)
+	w.WaitForEvents()
+	assert.Nil(t, d1.popDragEvent())
+	assert.Nil(t, d2.popDragEvent())
+
 	// no drag event on mouseDown
 	w.mouseClicked(w.viewport, glfw.MouseButton1, glfw.Press, 0)
 	w.WaitForEvents()