Blurry icons on HiDPI display (GNU/Linux)

[Paul Menzel]

Dear LibreOffice folks,


Running LibreOffice 5.4.4.1 with GTK+ 3.22.26 on the HiDPI/4K monitor 
Dell U2718Q the icons in the toolbar are blurry as can be seen on the 
attached image.

```
$ libreoffice --version
LibreOffice 5.4.4.1 40m0(Build:1)

$ env | grep GDK
GDK_SCALE=2
GDK_DPI_SCALE=-1
```

Is that expected?


Kind regards,

Paul
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