Constant gdk4::BUTTON_SECONDARY 
source · pub const BUTTON_SECONDARY: u32 = _; // 3u32Expand description
The secondary button. This is typically the right mouse button, or the left button in a left-handed setup.
pub const BUTTON_SECONDARY: u32 = _; // 3u32The secondary button. This is typically the right mouse button, or the left button in a left-handed setup.