This function returns whether a GdkEventButton should trigger a
context menu, according to platform conventions. The right mouse
button always triggers context menus. Additionally, if
gdk_keymap_get_modifier_mask() returns a non-0 mask for
GDK_MODIFIER_INTENT_CONTEXT_MENU, then the left mouse button will
also trigger a context menu if this modifier is pressed.
This function should always be used instead of simply checking for
event->button == GDK_BUTTON_SECONDARY.
This function returns whether a GdkEventButton should trigger a context menu, according to platform conventions. The right mouse button always triggers context menus. Additionally, if gdk_keymap_get_modifier_mask() returns a non-0 mask for GDK_MODIFIER_INTENT_CONTEXT_MENU, then the left mouse button will also trigger a context menu if this modifier is pressed. This function should always be used instead of simply checking for event->button == GDK_BUTTON_SECONDARY.