From 2b7f19d2699ed1a16342605a72740a3fdc377460 Mon Sep 17 00:00:00 2001
From: Romain Vimont <rom@rom1v.com>
Date: Sun, 20 Jun 2021 00:42:55 +0200
Subject: [PATCH] Forward mouse motion only on main clicks

Mouse motion events were forwarded as soon as any button was pressed on
the mouse.

Instead, only consider left-click (and also middle-click and right-click
if --forward-all-clicks is enabled).
---
 app/src/input_manager.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/app/src/input_manager.c b/app/src/input_manager.c
index b008c4db22..a5d0ad07a0 100644
--- a/app/src/input_manager.c
+++ b/app/src/input_manager.c
@@ -595,8 +595,12 @@ convert_mouse_motion(const SDL_MouseMotionEvent *from, struct screen *screen,
 static void
 input_manager_process_mouse_motion(struct input_manager *im,
                                    const SDL_MouseMotionEvent *event) {
-    if (!event->state) {
-        // do not send motion events when no button is pressed
+    uint32_t mask = SDL_BUTTON_LMASK;
+    if (im->forward_all_clicks) {
+        mask |= SDL_BUTTON_MMASK | SDL_BUTTON_RMASK;
+    }
+    if (!(event->state & mask)) {
+        // do not send motion events when no click is pressed
         return;
     }
     if (event->which == SDL_TOUCH_MOUSEID) {