sjx

Still an issue in 1.13.

Code analysis

Please link to this comment in the description.

The following is based on the decompiled version of Minecraft 1.13.

In net.minecraft.client.gui.GuiListWorldSelectionEntry

public void drawEntry(int listWidth, int slotHeight, int mouseX, int mouseY, boolean isSelected, float partialTicks)
{
    int y = this.getY();
    int x = this.getX();
    // ...
    if (this.client.gameSettings.touchscreen || isSelected)
    {
        // ...
        int j = mouseX - x;
        int i = j < 32 ? 32 : 0;

        if (this.worldSummary.markVersionInList())
        {
            Gui.drawModalRectWithCustomSizedTexture(x, y, 32.0F, (float)i, 32, 32, 256.0F, 256.0F);
            // ...
        }
        else
        {
            Gui.drawModalRectWithCustomSizedTexture(x, y, 0.0F, (float)i, 32, 32, 256.0F, 256.0F);
        }
    }
    // ...
}

public void drawEntry(int listWidth, int slotHeight, int mouseX, int mouseY, boolean isSelected, float partialTicks)
{
    int y = this.getY();
    int x = this.getX();
    // ...
    if (this.client.gameSettings.touchscreen || isSelected)
    {
        // ...
        int j = mouseX - x;
        int i = j < 32 ? 32 : 0;

        if (this.worldSummary.markVersionInList())
        {
            Gui.drawModalRectWithCustomSizedTexture(x, y, 32.0F, (float)i, 32, 32, 256.0F, 256.0F);
            // ...
        }
        else
        {
            Gui.drawModalRectWithCustomSizedTexture(x, y, 0.0F, (float)i, 32, 32, 256.0F, 256.0F);
        }
    }
    // ...
}

It seems that whether the mouse is actually on the arrow is never checked.

Solution

In net.minecraft.client.gui.GuiListWorldSelectionEntry, net.minecraft.client.gui.ServerListEntryNormal and net.minecraft.client.resources.ResourcePackListEntryFound, check if the entry isSelected before rendering colored arrows.

Duplicates MC-124375

@gaspoweredpick I cannot test right now. Try disabling the vanilla data pack and see if you can reproduce this.

Fixed in macOS 10.13.3 (17D47)

Confirmed for 17w43a-17w45b.

Try updating your computer's graphics driver

Still in 1.9

Confirmed in 16w06a.

I have these log in single player too:
{{{quote}
[11:31:35] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2092ms behind, skipping 41 tick(s)
[11:31:57] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 8250ms behind, skipping 165 tick(s)
[11:32:12] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 6955ms behind, skipping 139 tick(s)
[11:32:27] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 4721ms behind, skipping 94 tick(s)
[11:34:25] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2233ms behind, skipping 44 tick(s)

}}

After exit the GUI press 'A' again without CMD

Confirmed.

Confirmed in 1.8.