#155 Minimap draws blank in buildings and cities when the minimap frame is partly transparent

Status: Awaiting review · Area: UI & Interface · Addons & API

If the minimap is made partly transparent, it turns blank inside buildings and cities until the next redraw.

Current behavior

If the minimap frame (MinimapCluster or Minimap) has an alpha below 1, the map is drawn blank in building interiors and cities whenever the game redraws it (moving into a new section, e.g. when a room name like "Library Wing" appears). It stays blank until the next redraw. Hiding and showing the Minimap frame blanks it the same way. At alpha 1 it always works. Build 1.60.1.70009, Windows 11, D3D12.

Expected behavior

The map draws normally at any frame alpha, the same as it does outdoors.

How to reproduce

1. Disable all addons.
2. Type /run MinimapCluster:SetAlpha(0.6)
3. Walk into Northshire Abbey (Elwynn Forest) and through a few rooms until a room name appears.
4. The minimap goes blank. Type /run MinimapCluster:SetAlpha(1) and it draws fine again after the next redraw.