[macOS] Fix missing text on loading error screens (#4532)

patches/minecraft/net/minecraft/client/renderer/texture/TextureMap.java.patch

@@ -164,17 +164,16 @@
              {
                  String s = textureatlassprite1.func_94215_i();
                  map.remove(s);
-@@ -186,6 +257,9 @@
+@@ -186,6 +257,8 @@
          {
              textureatlassprite2.func_94217_a(this.field_94249_f);
          }
-+        org.lwjgl.opengl.GL11.glFlush(); // Some systems (mainly macs) need this to make sure the texture map creation finishes before moving on
 +        net.minecraftforge.client.ForgeHooksClient.onTextureStitchedPost(this);
 +        net.minecraftforge.fml.common.ProgressManager.pop(bar);
      }
  
      private boolean func_184397_a(IResourceManager p_184397_1_, final TextureAtlasSprite p_184397_2_)
-@@ -195,7 +269,7 @@
+@@ -195,7 +268,7 @@
          label62:
          {
              boolean flag;
@@ -183,7 +182,7 @@
              try
              {
                  iresource = p_184397_1_.func_110536_a(resourcelocation);
-@@ -292,7 +366,7 @@
+@@ -292,7 +365,7 @@
          }
          else
          {
@@ -192,7 +191,7 @@
  
              if (textureatlassprite == null)
              {
-@@ -318,4 +392,52 @@
+@@ -318,4 +391,52 @@
      {
          return this.field_94249_f;
      }

src/main/java/net/minecraftforge/fml/client/SplashProgress.java

@@ -651,6 +651,7 @@ public class SplashProgress
             checkThreadState();
             done = true;
             thread.join();
+            glFlush();        // process any remaining GL calls before releaseContext (prevents missing textures on mac)
             d.releaseContext();
             Display.getDrawable().makeCurrent();
             fontTexture.delete();