[Bug Explanation/Fix] Tooltip Rendering Issue when Adding Layers with (0.11.2+1.20 targeted issue, though may exist in current)

[u9g]

This code will cause hovered tooltips in the containerscreen gui to have no text rendered:

private fun chestCloseButtonInitializer(instance: Layer<ContainerScreen, FlowLayout>.Instance) {
        val closeButton = Components.button(
            net.minecraft.network.chat.Component.literal("Close")
        ) {
            Minecraft.getInstance().setScreen(null)
        }.sizing(Sizing.content(), Sizing.fixed(16))

        // Wrap in a fixed-width container to center it
        val buttonContainer = Containers.horizontalFlow(Sizing.fixed(176), Sizing.content())
            .child(closeButton)
            .horizontalAlignment(HorizontalAlignment. CENTER)

        instance.adapter.rootComponent.child(buttonContainer)

        // Position at x=0 (left edge of GUI), y=-18 (above GUI)
        instance.alignComponentToHandledScreenCoordinates(buttonContainer, 0, -18)
    }

    override fun onInitializeClient() {
        // make the instanceInitializer reference a class method so hot reload works.

        Layers.add(
            Containers::verticalFlow,
            ::chestCloseButtonInitializer,
            ContainerScreen::class.java
        )
}

This mixin fixes that issue:

package dev.u9g.utils.mixin.client;

import net.minecraft.client.gui.GuiGraphics;
import net.minecraft.client.gui.screens.inventory.ContainerScreen;
import org.spongepowered.asm.mixin.Mixin;
import org.spongepowered.asm.mixin.injection.At;
import org.spongepowered.asm.mixin.injection.Inject;
import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;

@Mixin(ContainerScreen.class)
public class ContainerScreenMixin {

    @Inject(method = "render", at = @At("TAIL"))
    private void flushTooltipBuffer(GuiGraphics guiGraphics, int mouseX, int mouseY, float partialTick, CallbackInfo ci) {
        // Force the text vertices buffered during renderTooltip to draw NOW
        // before the method returns and the RenderSystem state changes.
        guiGraphics.flush();
    }
}