Button text gets cut off when using canvas_items stretch mode and font oversampling

[romlok]

Tested versions

Reproducible in: v4.3.stable.official [77dcf97]

System information

Godot v4.3.stable - Debian GNU/Linux trixie/sid trixie - Wayland - Vulkan (Forward+) - dedicated AMD Radeon RX 7600 (RADV NAVI33) - AMD Ryzen 5 7600 6-Core Processor (12 Threads)

Issue description

If a Button is sized as small as it can be (eg. when using "center" anchors), the final character of the text gets cut off at certain scaling values when using canvas_items scaling and font oversampling.

Seems similar to #81624, but now happening only when there isn't any "extra" space around the text.

Steps to reproduce

1. Set project's stretch mode to canvas_items
2. Create a button, give it some text, and center it using anchors
3. Run the project/scene
4. 👀 Scale the window

Minimal reproduction project (MRP)

qui.zip