From b3ff3664673602dbc38157db403517579c56eb8c Mon Sep 17 00:00:00 2001
From: Lee Pugh <4343398+organicpencil@users.noreply.github.com>
Date: Wed, 19 Dec 2018 11:19:05 -0600
Subject: [PATCH] Fix missed captured mouse events on x11

---
 platform/x11/os_x11.cpp | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/platform/x11/os_x11.cpp b/platform/x11/os_x11.cpp
index 34ec8709c41..f15dd35d65d 100644
--- a/platform/x11/os_x11.cpp
+++ b/platform/x11/os_x11.cpp
@@ -1885,12 +1885,23 @@ void OS_X11::process_xevents() {
 						// Determine the axis used (called valuators in XInput for some forsaken reason)
 						//  Mask is a bitmask indicating which axes are involved.
 						//  We are interested in the values of axes 0 and 1.
-						if (raw_event->valuators.mask_len <= 0 || !XIMaskIsSet(raw_event->valuators.mask, 0) || !XIMaskIsSet(raw_event->valuators.mask, 1)) {
+						if (raw_event->valuators.mask_len <= 0) {
 							break;
 						}
 
-						double rel_x = raw_event->raw_values[0];
-						double rel_y = raw_event->raw_values[1];
+						const double *values = raw_event->raw_values;
+
+						double rel_x = 0.0;
+						double rel_y = 0.0;
+
+						if (XIMaskIsSet(raw_event->valuators.mask, 0)) {
+							rel_x = *values;
+							values++;
+						}
+
+						if (XIMaskIsSet(raw_event->valuators.mask, 1)) {
+							rel_y = *values;
+						}
 
 						// https://bugs.freedesktop.org/show_bug.cgi?id=71609
 						// http://lists.libsdl.org/pipermail/commits-libsdl.org/2015-June/000282.html