[3.x] Scaling in windowed mode can crash the Linux Operating System

### Tested versions

Reproducible in the Godot 3.6.0 release, other versions untested.

### System information

OS: Linux Mint 22 Cinnamon GPU: Intel Corporation Alder Lake-UP3 GT2 [UHD Graphics] CPU: 12th Gen Intel© Core™ i5-1235U × 10

### Issue description

Viewports can cause the OS to slow down under certain circumstances, eventually freezing and/or crashing the entire OS and potentially corrupting the open project as a result.

I have not tested this on other operating systems or hardware, nor have I tested to see if there are other steps that can be taken to reproduce the issue.

### Steps to reproduce

1. Create an AspectRatioContainer with a typical 3D Viewport setup as its child.
2. Set AspectRatioContainer.ratio to 1.7778 and AspectRatioContainer.stretch mode to STRETCH_COVER (or anything besides STRETCH_FIT).
3. Set "display/window/stretch/mode" to 2d and "display/window/stretch/aspect" to Expand.
4. Launch the project in windowed mode, then scale the window as thin as you can and start moving it around. After a few seconds of slowing down the computer (most obvious when listening to audio) it will begin to freeze and then crash after about 5-10 seconds.

You can skip to step 4 when using the MRP.

### Minimal reproduction project (MRP)

[Viewport Crash.zip](https://github.com/user-attachments/files/18305837/Viewport.Crash.zip)

Start with the attached Viewport Crash.zip minimal reproduction project and follow the four listed steps using windowed mode, 2D stretch, Expand aspect, and STRETCH_COVER. Investigate the viewport and window-scaling behavior while reproducing the slowdown and freeze on Linux. Done means resizing and moving the thin window no longer causes severe system slowdown, freezing, or an operating-system crash.

Written by the indexing model from the issue text.