Drop-down menus sometimes close automatically after opening
Steps to reproduce
- Open the GTK demo application with
gtk3-demoin the terminal.
- Open the Combo Boxes example.
- Click the Combo Box with the value Boston or on the one with the value Warning.
The Drop-down menu appears but immediately closes.
The drop down menu should stay open until I click elsewhere or close it by pressing ESC.
- GTK Version: GTK+3
brew install gtk+3.
- Operation System: macOS Mojave
In the attached video you can see the bug when clicking the combo box with the value Warning a second time. The first time the drop-down menu stayed open. I use a Magic Mouse 2 but the problem occurs with a regular USB-Mouse as well.
I originally reported this bug in the Inkscape issue tracker here: https://gitlab.com/inkscape/inkscape/issues/301.