Double-clicking a thumbnail to make image fullscreen immediately switches to the next image

[HolyBlackCat]

Setup (please complete the following information):

• Distribution: Arch
• Distribution release: :upside_down_face:
• Geeqie version [geeqie --version]: Geeqie 2.4 GTK3

Describe the bug

Double-clicking a thumbnail is supposed to open that image fullscreen. It does that, but it also immediately switches to the next image.

If you click slowly, you can see that pressing the mouse the second time opens the fullscreen, and then releasing it switches the image.

To reproduce Steps to reproduce the behavior:

• Double-click a specific image thumbnail.
• Observe the immediate switch to the next image.

Expected behavior Double-clicking a thumbnail should just open that image fullscreen, and not switch to the next one.