Hearts of Iron 4

**Game information**
Hoi4

**Distribution name and version where applicable**
- /etc/arch-release

**Flatpak info**
### flatpak --version
- Flatpak 1.8.1

### flatpak --gl-drivers
- default
- host

**Problem description**
Pictures say more than words

I click play then,


No mods enabled.

**Does this issue reproduce with native Steam**
~~Have not tested,~~ Tested, same result.

I have run hoi4 native before about a year ago and it worked pretty good as I recall.

## Error Logs

> excemption.txt
```
Application: HOI4
Version: Husky v1.9.3
Date/Time: 2020-08-22 20:09:41

Caught signal 8 (SIGFPE)

Original Stack Trace:
./hoi4(_ZN9CGraphicsC2E13SWindowHandleR17CGraphicsSettings+0x3b9) [0x2365639]
./hoi4(_ZN13CGameGraphicsC1E13SWindowHandleR17CGraphicsSettings+0x19) [0x13e25c9]
./hoi4(_ZN16CGameApplication8InitBaseEb+0xaa6) [0x1a46a46]
./hoi4(_ZN16CGameApplication4InitEv+0x1c4) [0x1a45c24]
./hoi4(_Z7RunGameiPPc+0x294b) [0xf51a7b]
/usr/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f2907ce6183]
./hoi4(_start+0x29) [0xf4a799]

Demangled Stack Trace:
./hoi4 ( CGraphics::CGraphics(SWindowHandle, CGraphicsSettings&) + 0x3b9 ) [0x2365639]
./hoi4 ( CGameGraphics::CGameGraphics(SWindowHandle, CGraphicsSettings&) + 0x19 ) [0x13e25c9]
./hoi4 ( CGameApplication::InitBase(bool) + 0xaa6 ) [0x1a46a46]
./hoi4 ( CGameApplication::Init() + 0x1c4 ) [0x1a45c24]
./hoi4 ( RunGame(int, char**) + 0x294b) [0xf51a7b]
/usr/lib/x86_64-linux-gnu/libc.so.6 ( __libc_start_main + 0xf3 ) [0x7f2907ce6183]
./hoi4 ( _start + 0x29 ) [0xf4a799
```

Start by reproducing Hearts of Iron 4 from the Steam Flatpak on Arch Linux, comparing the native Steam result with the attached SIGFPE log. The log points to graphics initialization in HOI4; done means identifying a reproducible, project-actionable cause and confirming that the game launches without the reported crash.

Written by the indexing model from the issue text.