From 005d505cc4a9cf07de1d15d51cc1cc72dbb49f73 Mon Sep 17 00:00:00 2001
From: Alexandre Bury <alexandre.bury@gmail.com>
Date: Mon, 5 Nov 2018 10:59:55 -0800
Subject: [PATCH] Enable wheel down detection on ubuntu

---
 src/backend/curses/n.rs | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/backend/curses/n.rs b/src/backend/curses/n.rs
index e76e2ed..abb4042 100644
--- a/src/backend/curses/n.rs
+++ b/src/backend/curses/n.rs
@@ -123,8 +123,21 @@ impl InputParser {
             if mevent.bstate == ncurses::REPORT_MOUSE_POSITION as mmask_t {
                 // The event is either a mouse drag event,
                 // or a weird double-release event. :S
+
                 self.last_mouse_button
                     .map(MouseEvent::Hold)
+                    .or_else(|| {
+                        // In legacy mode, some buttons overlap,
+                        // so we need to disambiguate.
+                        if mevent.bstate
+                            == ncurses::BUTTON5_DOUBLE_CLICKED as mmask_t
+                        {
+                            Some(MouseEvent::WheelDown)
+                        } else {
+                            // None
+                            Some(MouseEvent::WheelDown)
+                        }
+                    })
                     .map(&make_event)
                     .unwrap_or_else(|| Event::Unknown(vec![]))
             } else {
@@ -149,8 +162,14 @@ impl InputParser {
                     });
                 }
                 if let Some(event) = event {
-                    if let Some(btn) = event.button() {
-                        self.last_mouse_button = Some(btn);
+                    match event {
+                        MouseEvent::Press(btn) => {
+                            self.last_mouse_button = Some(btn);
+                        }
+                        MouseEvent::Release(_) => {
+                            self.last_mouse_button = None;
+                        }
+                        _ => (),
                     }
                     make_event(event)
                 } else {