The workaround 'Keep previews of minimised windows' stops windows from restoring after minimising

[FOSS victim #187345]

Hello.

I just had this strange behaviour whilst trying out a workaround for the incorrect window preview thumbnails issue.

When I enable the workaround 'Keep previews of minimised windows', it seems to stop me 'unminimising' minimised windows more than once.

1. I enable 'Keep previews of minimised windows' in 'Workarounds' in compiz-config;

2. Minimise a window (in my case, the compiz-config window);

3. Try to immediately restore the window by clicking on it's window button in the xfce4-panel;

4. Nothing happens, though you can seem to 'resize' and 'move' the ghostly apparition of a window via it's menu from the panel, nothing appears;

5. Click on another window or rotate your cube.

6. Clicking on the window button (immediately after changing focus) restores the window from the window button as expected;

7. Minimise the window once more;

8. Goto 3;

System info
===========

Compiz 0.9.13.1

System: Host: REDACTED Kernel: 4.15.0-72-generic x86_64 bits: 64 Desktop: Xfce 4.12.3 Distro: Linux Mint 19.2 Tina

Machine: Type: Desktop Mobo: ASRock model: Q1900-ITX serial: <root required> UEFI: American Megatrends v: P1.40
           date: 10/31/2014

CPU: Quad Core: Intel Celeron J1900 type: MCP speed: 1724 MHz min/max: 1333/2416 MHz

Graphics: Device-1: Intel Atom Processor Z36xxx/Z37xxx Series Graphics & Display driver: i915 v: kernel
           Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa resolution: 1440x900~60Hz
           OpenGL: renderer: Mesa DRI Intel Bay Trail v: 4.2 Mesa 19.0.8

Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169

Drives: Local Storage: total: 134.16 GiB used: 114.92 GiB (85.7%)

Info: Processes: 267 Uptime: 8d 12h 41m Memory: 7.26 GiB used: 4.30 GiB (59.3%) Shell: bash inxi: 3.0.32

I hope this information is useful - If you need any more let me know. Many thanks for any insights.