"borderWidth = 0" breaks some Java programs (IntelliJ IDEA, CLion) regardless of wmname or nonreparenting env var

[redlet]

Problem Description

First discovered in 2017, the infamous "gray box" issue occurs ONLY if borderWidth = 0. With the correct environment variable and borderWidth set to a positive integer, everything is fine.
https://stackoverflow.com/questions/41832881/java-gui-xmonad-not-working

Configuration File

Please include the smallest configuration file that reproduces the
problem you are experiencing:

myTerminal = "alacritty"

myLayout = tiled ||| (Mirror tiled) ||| Full
  where
     tiled   = Tall nmaster delta ratio
     nmaster = 1
     ratio   = toRational (2 / (1 + sqrt 5 :: Double))
     delta   = 3 / 100

myManageHook = composeAll
    [ isFullscreen --> doFullFloat
    , FS.fullscreenManageHook
    ]

quitWithWarning :: X ()
quitWithWarning = do
    let m = "confirm quit"
    s <- dmenu [m]
    when (m == s) (io exitSuccess)

main = do
    xmproc <- spawnPipe "xmobar"
    xmonad $ desktopConfig
        { terminal = myTerminal
        , borderWidth = 0 -- breaks the solution
        , manageHook = myManageHook <+> manageHook desktopConfig
        , layoutHook = desktopLayoutModifiers $ noBorders $ myLayout
        , handleEventHook = fullscreenEventHook <+> handleEventHook desktopConfig
        , logHook = dynamicLogWithPP xmobarPP
                { ppOutput = hPutStrLn xmproc
                , ppTitle = xmobarColor "green" "" . shorten 50
                }
        , startupHook = setWMName "LG3D" -- solution to a problem here
        } `removeKeys`
        [ (mod1Mask, xK_Return)
	] `additionalKeys`
	[ ((mod1Mask .|. shiftMask, xK_q), quitWithWarning)
	]

Checklist

• I've read CONTRIBUTING.md

• I tested my configuration with xmonad-testing

[slotThe]

At this point, does setting _JAVA_AWT_WM_NONREPARENTING=1 (as, e.g., javaHack does it) help?

[Scherso]

I had a similar issue with Jetbrains IDE’s, which is caused by its use of javax.swing as its GUI library.
Adding the line Hacks.javaHacks to my main function solved this issue, you can do this like so;

import qualified XMonad.Util.Hacks as Hacks

main = do
    xmonad
    $ Hacks.javaHack
    {- the rest of your function -}