ui issue: menu stuff accumulates on the bottom of the screen

[anoobindisguise]

Describe the bug

Sometimes, old menus are visible at the very bottom of the window. This seems to usually happen when windowed and maximized. I haven't tested specifically fullscreen or a shrunk window.

I thought this was imgui related but it seems to not be the case, per Renech. Going to leave the issue open for now, because it is still some kind of problem, even if it's not the one I thought.

Attach save file

n/a

Steps to reproduce

Unsure how to replicate. It seems to just gradually happen as you play the game and open and close menus. I cannot reliably cause it to happen but it tends to occur over time regardless.

Expected behavior

Expired UIs stop being visible entirely.

Screenshots

Here I was autotraveling in the map menu. You can see the lower slice of some crafting-related menu at the very bottom.

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19045.6466 (22H2)
• Game Version: cdda-experimental-2026-01-07-0012-dirty [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  Slowdown Fungal Growth [no_fungal_growth],
  Bionic Slots [cbm_slots],
  Portal Storms Ignore NPCs [personal_portal_storms],
  Bombastic Perks [bombastic_perks]
  ]

Additional context

No response

[RenechCDDA]

This isn't imgui related, your window size isn't cleanly divisible by your selected terminal size.

[db48x]

Specifically it stops drawing the map before it reaches the edge of the window. If it drew one more row of tiles, even though they would be partially obscured, then this wouldn’t happen. Alternatively it could clear the screen every frame.

Technically ImGui assumes that the screen gets cleared every frame. Most of the time the fact that we don’t doesn’t matter, but it can cause funny problems.

I think we should do both.

FWIW, this is a duplicate of an earlier bug report but I couldn’t find the earlier one with a casual search.