Lose focus when IDEA windows is opening

**the version of Guake that I'm using**
3.6.3

**Describe the bug**
Guake will lose focus when IDEA windows is opening.

If lose focus, I'm probably typing some letters into the editor of IDEA or just cancel the opening dialog because of pressing Enter/Space.

**Expected behavior**
The opening procedure of IDEA or other apps should not lead the Guake to lose focus.

**Actual behavior**
Guake will lose focus when IDEA windows is opening.

**To Reproduce**
- Open the IDEA
- Type continuous in the Guake
- Guake will lose focus, you will type into IDEA

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Please run `$ guake --support`, and paste the results here. Don't put backticks (`` ` ``) around it! The output already contains Markdown formatting. And make sure you run the command **OUTSIDE** the Guake.

$ guake --support

Guake Version: 3.6.3

Vte Version: 0.56.3

Vte Runtime Version: 0.56.3

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GTK+ Version: 3.24.8

GDK Backend: GdkX11.X11Display

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Desktop Session: gnome

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Display: :1

RGBA visual: True

Composited: True

* Monitor: 0 - eDP-1-1
* Geometry: 1920 x 1080 at 0, 0
* Size: 344 x 194 mm²
* Primary: True
* Refresh rate: 120.02 Hz
* Subpixel layout: unknown