TextNode 'set_small_caps' does not work on 1.11.0

[Benjamin8693]

Description

The 'set_small_caps' method of TextNode does not work. It does set the 'small_caps' field successfully (evident if you call 'get_small_caps'), but it does not have any visual impact on text once generated. This works as intended on 1.10.14.

Functional example:

Non-functional example:

Steps to Reproduce

1. Create this file:

from direct.showbase.ShowBase import ShowBase
from panda3d.core import NodePath, TextNode

class Demo(ShowBase):

    def __init__(self):
        ShowBase.__init__(self)

        styling = TextNode('status')
        styling.set_align(TextNode.ACenter)
        styling.set_text_color(1, 1, 1, 1)
        styling.set_shadow(0.075, 0.075)
        styling.set_small_caps(True)
        styling.set_text("Testy McTest!")

        letter = NodePath(styling.generate())
        letter.reparent_to(aspect2d)
        letter.set_scale(0.25)

demo = Demo()
demo.run()

2. Run it
3. Note that the lowercase letters have not changed as expected (see documentation)

Environment

• Operating system: Linux Mint 21.3
• System architecture: x64
• Panda3D version: 1.11.0 latest master
• Installation method: pip
• Python version (if using Python): 3.10.12
• Compiler (if using C++): N/A

[derpydraggo]

From what I can tell, I'm 95% certain that commit 0dad38d (which changed to defaulting the config variable text-use-harfbuzz to true, if Panda3D is built with it) is what's causing the issue here; reason being, from what I can also gather, there doesn't seem to be any code that handles small caps with harfbuzz. On top of that, when I built master with the --no-harbuzz option, the demo code's text resembled the functional example.

If you want, I could look into adding that functionality if Panda3D is built with harfbuzz and text-use-harfbuzz is also true.

[rdb]

Feel free to look into it, thank you!