[BUG]: Using Unreal Engine 5+ A phantom window appears and consumes a tile #498

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opened 2026-01-05 14:51:07 +01:00 by adam · 2 comments
Owner

Originally created by @allora on GitHub (Oct 17, 2024).

Summary

Using Unreal Engine 5 (seems any version will do this, unsure of unreal engine 4), starting the editor will create a phantom window. I can alt F4 on this window and close it, but it consumes a tile in Komorebi until then. Ultimately this is probably something unreal is doing, but i wonder if Komorebi can just.. ignore it heh

Version Information

OS Name: Microsoft Windows 10 Pro
OS Version: 10.0.19045 N/A Build 19045

komorebic 0.1.29
tag:v0.1.29
commit_hash:818ac340
build_time:2024-09-28 01:48:31 +00:00
build_env:rustc 1.81.0 (eeb90cda1 2024-09-04),stable-x86_64-pc-windows-msvc

Komorebi Configuration

{
  "$schema": "https://raw.githubusercontent.com/LGUG2Z/komorebi/master/schema.json",
  "app_specific_configuration_path": "$Env:USERPROFILE/applications.yaml",
  "window_hiding_behaviour": "Cloak",
  "cross_monitor_move_behaviour": "Insert",
  "alt_focus_hack": true,
  "default_workspace_padding": 5,
  "default_container_padding": 5,
  "active_window_border": true,
  "active_window_border_colours": {
    "single": { "r": 200, "g": 100, "b": 66 },
    "stack": { "r": 256, "g": 165, "b": 66 },
    "monocle": { "r": 255, "g": 51, "b": 153 }
  },
  "active_window_border_width": 10,
  "monitors": [
    {
      "workspaces": [
        { "name": "1", "layout": "VerticalStack" },
        { "name": "2", "layout": "VerticalStack" },
        { "name": "3", "layout": "VerticalStack" },
        { "name": "4", "layout": "VerticalStack" },
        { "name": "5", "layout": "VerticalStack" },
        { "name": "6", "layout": "VerticalStack" },
        { "name": "7", "layout": "VerticalStack" },
        { "name": "8", "layout": "VerticalStack" },
        { "name": "9", "layout": "VerticalStack" },
        { "name": "10", "layout": "VerticalStack" }
      ]
    }
  ]
}

Hotkey Configuration

.shell powershell

Reload whkd configuration

alt + o : taskkill /f /im whkd.exe && start /b whkd # if shell is cmd

alt + o : taskkill /f /im whkd.exe && Start-Process whkd -WindowStyle hidden # if shell is pwsh / powershell
alt + shift + o : komorebic reload-configuration

App shortcuts - these require shell to be pwsh / powershell

The apps will be focused if open, or launched if not open

alt + f : if ($wshell.AppActivate('Firefox') -eq $False) { start firefox }

alt + b : if ($wshell.AppActivate('Chrome') -eq $False) { start chrome }

Focus windows

alt + h : komorebic focus left
alt + j : komorebic focus down
alt + k : komorebic focus up
alt + l : komorebic focus right
alt + shift + oem_4 : komorebic cycle-focus previous # oem_4 is [
alt + shift + oem_6 : komorebic cycle-focus next # oem_6 is ]

Move windows

alt + shift + h : komorebic move left
alt + shift + j : komorebic move down
alt + shift + k : komorebic move up
alt + shift + l : komorebic move right
alt + shift + return : komorebic promote

Stack windows

alt + left : komorebic stack left
alt + down : komorebic stack down
alt + up : komorebic stack up
alt + right : komorebic stack right
alt + oem_1 : komorebic unstack # oem_1 is ;
alt + oem_4 : komorebic cycle-stack previous # oem_4 is [
alt + oem_6 : komorebic cycle-stack next # oem_6 is ]

Resize

alt + oem_plus : komorebic resize-axis horizontal increase
alt + oem_minus : komorebic resize-axis horizontal decrease
alt + shift + oem_plus : komorebic resize-axis vertical increase
alt + shift + oem_minus : komorebic resize-axis vertical decrease

Manipulate windows

alt + t : komorebic toggle-float
alt + shift + f : komorebic toggle-monocle

Window manager options

alt + shift + r : komorebic retile
alt + p : komorebic toggle-pause

Layouts

alt + x : komorebic flip-layout horizontal
alt + y : komorebic flip-layout vertical

Workspaces

alt + 1 : komorebic focus-workspace 0
alt + 2 : komorebic focus-workspace 1
alt + 3 : komorebic focus-workspace 2
alt + 4 : komorebic focus-workspace 3
alt + 5 : komorebic focus-workspace 4
alt + 6 : komorebic focus-workspace 5
alt + 7 : komorebic focus-workspace 6
alt + 8 : komorebic focus-workspace 7
alt + 9 : komorebic focus-workspace 8
alt + 0 : komorebic focus-workspace 9

Move windows across workspaces

alt + shift + 1 : komorebic move-to-workspace 0
alt + shift + 2 : komorebic move-to-workspace 1
alt + shift + 3 : komorebic move-to-workspace 2
alt + shift + 4 : komorebic move-to-workspace 3
alt + shift + 5 : komorebic move-to-workspace 4
alt + shift + 6 : komorebic move-to-workspace 5
alt + shift + 7 : komorebic move-to-workspace 6
alt + shift + 8 : komorebic move-to-workspace 7
alt + shift + 9 : komorebic move-to-workspace 8
alt + shift + 0 : komorebic move-to-workspace 9

Output of komorebic check

No KOMOREBI_CONFIG_HOME detected, defaulting to C:\Users<user>

Looking for configuration files in C:\Users<user>

Found komorebi.json; this file can be passed to the start command with the --config flag

Found C:\Users<user>.config\whkdrc; key bindings will be loaded from here when whkd is started, and you can start it automatically using the --whkd flag

Originally created by @allora on GitHub (Oct 17, 2024). ### Summary Using Unreal Engine 5 (seems any version will do this, unsure of unreal engine 4), starting the editor will create a phantom window. I can alt F4 on this window and close it, but it consumes a tile in Komorebi until then. Ultimately this is probably something unreal is doing, but i wonder if Komorebi can just.. ignore it heh ### Version Information OS Name: Microsoft Windows 10 Pro OS Version: 10.0.19045 N/A Build 19045 komorebic 0.1.29 tag:v0.1.29 commit_hash:818ac340 build_time:2024-09-28 01:48:31 +00:00 build_env:rustc 1.81.0 (eeb90cda1 2024-09-04),stable-x86_64-pc-windows-msvc ### Komorebi Configuration ```json { "$schema": "https://raw.githubusercontent.com/LGUG2Z/komorebi/master/schema.json", "app_specific_configuration_path": "$Env:USERPROFILE/applications.yaml", "window_hiding_behaviour": "Cloak", "cross_monitor_move_behaviour": "Insert", "alt_focus_hack": true, "default_workspace_padding": 5, "default_container_padding": 5, "active_window_border": true, "active_window_border_colours": { "single": { "r": 200, "g": 100, "b": 66 }, "stack": { "r": 256, "g": 165, "b": 66 }, "monocle": { "r": 255, "g": 51, "b": 153 } }, "active_window_border_width": 10, "monitors": [ { "workspaces": [ { "name": "1", "layout": "VerticalStack" }, { "name": "2", "layout": "VerticalStack" }, { "name": "3", "layout": "VerticalStack" }, { "name": "4", "layout": "VerticalStack" }, { "name": "5", "layout": "VerticalStack" }, { "name": "6", "layout": "VerticalStack" }, { "name": "7", "layout": "VerticalStack" }, { "name": "8", "layout": "VerticalStack" }, { "name": "9", "layout": "VerticalStack" }, { "name": "10", "layout": "VerticalStack" } ] } ] } ``` ### Hotkey Configuration .shell powershell # Reload whkd configuration # alt + o : taskkill /f /im whkd.exe && start /b whkd # if shell is cmd alt + o : taskkill /f /im whkd.exe && Start-Process whkd -WindowStyle hidden # if shell is pwsh / powershell alt + shift + o : komorebic reload-configuration # App shortcuts - these require shell to be pwsh / powershell # The apps will be focused if open, or launched if not open # alt + f : if ($wshell.AppActivate('Firefox') -eq $False) { start firefox } # alt + b : if ($wshell.AppActivate('Chrome') -eq $False) { start chrome } # Focus windows alt + h : komorebic focus left alt + j : komorebic focus down alt + k : komorebic focus up alt + l : komorebic focus right alt + shift + oem_4 : komorebic cycle-focus previous # oem_4 is [ alt + shift + oem_6 : komorebic cycle-focus next # oem_6 is ] # Move windows alt + shift + h : komorebic move left alt + shift + j : komorebic move down alt + shift + k : komorebic move up alt + shift + l : komorebic move right alt + shift + return : komorebic promote # Stack windows alt + left : komorebic stack left alt + down : komorebic stack down alt + up : komorebic stack up alt + right : komorebic stack right alt + oem_1 : komorebic unstack # oem_1 is ; alt + oem_4 : komorebic cycle-stack previous # oem_4 is [ alt + oem_6 : komorebic cycle-stack next # oem_6 is ] # Resize alt + oem_plus : komorebic resize-axis horizontal increase alt + oem_minus : komorebic resize-axis horizontal decrease alt + shift + oem_plus : komorebic resize-axis vertical increase alt + shift + oem_minus : komorebic resize-axis vertical decrease # Manipulate windows alt + t : komorebic toggle-float alt + shift + f : komorebic toggle-monocle # Window manager options alt + shift + r : komorebic retile alt + p : komorebic toggle-pause # Layouts alt + x : komorebic flip-layout horizontal alt + y : komorebic flip-layout vertical # Workspaces alt + 1 : komorebic focus-workspace 0 alt + 2 : komorebic focus-workspace 1 alt + 3 : komorebic focus-workspace 2 alt + 4 : komorebic focus-workspace 3 alt + 5 : komorebic focus-workspace 4 alt + 6 : komorebic focus-workspace 5 alt + 7 : komorebic focus-workspace 6 alt + 8 : komorebic focus-workspace 7 alt + 9 : komorebic focus-workspace 8 alt + 0 : komorebic focus-workspace 9 # Move windows across workspaces alt + shift + 1 : komorebic move-to-workspace 0 alt + shift + 2 : komorebic move-to-workspace 1 alt + shift + 3 : komorebic move-to-workspace 2 alt + shift + 4 : komorebic move-to-workspace 3 alt + shift + 5 : komorebic move-to-workspace 4 alt + shift + 6 : komorebic move-to-workspace 5 alt + shift + 7 : komorebic move-to-workspace 6 alt + shift + 8 : komorebic move-to-workspace 7 alt + shift + 9 : komorebic move-to-workspace 8 alt + shift + 0 : komorebic move-to-workspace 9 ### Output of komorebic check No KOMOREBI_CONFIG_HOME detected, defaulting to C:\Users\<user> Looking for configuration files in C:\Users\<user> Found komorebi.json; this file can be passed to the start command with the --config flag Found C:\Users\<user>\.config\whkdrc; key bindings will be loaded from here when whkd is started, and you can start it automatically using the --whkd flag
adam added the bug label 2026-01-05 14:51:07 +01:00
adam closed this issue 2026-01-05 14:51:07 +01:00
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@LGUG2Z commented on GitHub (Oct 17, 2024):

When the ghost tile is there, run "komorebic visible-windows" to get the information you need about it to add a rule ignoring it: https://lgug2z.github.io/komorebi/common-workflows/ignore-windows.html

@LGUG2Z commented on GitHub (Oct 17, 2024): When the ghost tile is there, run "komorebic visible-windows" to get the information you need about it to add a rule ignoring it: https://lgug2z.github.io/komorebi/common-workflows/ignore-windows.html
Author
Owner

@ajantti commented on GitHub (Oct 21, 2024):

Also for anyone having the same issues: temporary workaround I've been using for stuff I don't want to bother making special rules for is to switch to the window with alt + hjlk (or whatever) and then minimizing it with alt + m (or whatever).

It would be nice if the heuristics detected invisible windows though.

@ajantti commented on GitHub (Oct 21, 2024): Also for anyone having the same issues: temporary workaround I've been using for stuff I don't want to bother making special rules for is to switch to the window with alt + hjlk (or whatever) and then minimizing it with alt + m (or whatever). It would be nice if the heuristics detected invisible windows though.
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Reference: starred/komorebi#498