Problem

Diagnostic signs in NeoTree file explorer were displaying with an incorrect background color that didn't match the rest of the NeoTree interface. The signs inherited the defaultSignColumn background (colors.bg1) instead of blending properly with NeoTree's own background, creating a visual inconsistency.

Root Cause

NeoTree uses a specific highlight groupNeoTreeSignColumn for its sign column area, but this group wasn't configured in gruvbox.nvim. Without this configuration, diagnostic signs fell back to using the defaultSignColumn styling, which has a background color that doesn't match NeoTree's appearance.

Solution

Added the missingNeoTreeSignColumn highlight group configuration:

NeoTreeSignColumn= {bg="NONE"}

This makes the sign column background transparent, allowing NeoTree's own background styling to show through properly. The diagnostic signs now blend seamlessly with the rest of the NeoTree interface.

Changes

• lua/gruvbox.lua: AddedNeoTreeSignColumn = { bg = "NONE" } configuration
• tests/gruvbox/gruvbox_spec.lua: Added test case to verify the fix works correctly

The change follows existing code patterns in the theme (similar to how["@none"] is configured) and is minimal and surgical - addressing only the specific issue without affecting other functionality.

Fixes#405

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