* Output of `node_modules/.bin/electron --version`: v3.0.10
* Operating System (Platform and Version): Windows 10 x64 (1803  17134.345)
* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable):
v3.0.10
**Expected Behavior**
I would like to see the window move across the screen.

**Actual behavior**
The window moves around the screen. But first, the height of the window decreases.

**To Reproduce**
Write simple program that contains code:
`
mainWindow = new BrowserWindow({ width: 370,
		height: 270,
		x: 100,
		y: 100,
		resizable: false,
	 });
`
Start app. Grab the window with the mouse for its title and drag across the screen.

**Additional Information**
This error occurs when explicitly specifying the x, y coordinates of the window and the option "resizable: false".

atom/browser/native_window_views_win.cc
if (forward && !forwarding_mouse_messages_) {
    forwarding_mouse_messages_ = true;
    forwarding_windows_.insert(this);
    
    
    SetWindowSubclass(legacy_window_, SubclassProc, 1,
                      reinterpret_cast<DWORD_PTR>(this));
    if (!mouse_hook_) {
      mouse_hook_ = SetWindowsHookEx(WH_MOUSE_LL, MouseHookProc, NULL, 0);
    }
  } else if (!forward && forwarding_mouse_messages_) {
    forwarding_mouse_messages_ = false;
    forwarding_windows_.erase(this);
    RemoveWindowSubclass(legacy_window_, SubclassProc, 1);
    if (forwarding_windows_.size() == 0) {
      UnhookWindowsHookEx(mouse_hook_);
      mouse_hook_ = NULL;
    }
  }
}
LRESULT CALLBACK NativeWindowViews::SubclassProc(HWND hwnd,