Canvas not displaying after hiding and showing with ScaleViewport true

[tingyuguanhe]

Describe the bug
A clear and concise description of what the bug is.
Setting scaleViewport to true, after the element bound to the rfb object is set to display: none, and then it is shown again, the width and height of the canvas are both 0, causing the canvas to be unable to display.

Expectation: The canvas can be displayed normally after being hidden with display: none and then shown again.

To reproduce
Steps to reproduce the behavior:

1. Connect to a VNC server
2. Set style display: none
3. Set style display: block
4. The width and height of the canvas are both 0，causing the canvas to be unable to display.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Client (please complete the following information):

• OS: [e.g. iOS]
• Browser: [e.g. chrome, safari]
• Browser version: [e.g. 22]

Server (please complete the following information):

• noVNC version: 1.5.0
• VNC server: [e.g. QEMU, TigerVNC]
• WebSocket proxy: [e.g. websockify]

Additional context
Add any other context about the problem here.