On Wed, 2019-02-20 at 11:07 -0600, Igor Korot via gtk-list wrote:
Hi, ALL,
This link
states that the parameter "button" can be "-1".

What is the scenario when this occurs, i.e. it should be the button
number that was clicked IIUC?

Thank you for clarification.

Please use a more meaningful Subject next time.

And you may consider reading the API docs you linked to more carefully:

"Emitted when the user right-clicks the toolbar or uses the
keybinding to display a popup menu."

So it seems to be obviously that button = -1 is the case when a
keybinding is used to display a popup menu. (Because for this case
there is no button involved.)

When you continue reading the API docs, it is even more clear:

"The mouse button number is given by the button parameter. If the menu
was popped up using the keybaord, button is -1."

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