From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Thu, 20 Sep 2018 21:21:41 +0000 (+0200)
Subject: Ignore horizontal wheel scrolling in workarea
X-Git-Tag: 2.3.2~82
X-Git-Url: https://git.lyx.org/gitweb/?a=commitdiff_plain;h=bf3b81e46a8d82091948b519333daa55d1a31897;p=features.git

Ignore horizontal wheel scrolling in workarea

We do not know what to do with horizontal scrolling events, so we ignore them.

Note that the code has to be different between Qt4 and Qt5.

Fixes bug #11257.

(cherry picked from commit 2cfbc5ecf6e26da0ca3f61372e5373d1ef4f7ab7)
---

diff --git a/src/frontends/qt4/GuiWorkArea.cpp b/src/frontends/qt4/GuiWorkArea.cpp
index 4adb155fa2..f20ffe2d2c 100644
--- a/src/frontends/qt4/GuiWorkArea.cpp
+++ b/src/frontends/qt4/GuiWorkArea.cpp
@@ -897,7 +897,23 @@ void GuiWorkArea::wheelEvent(QWheelEvent * ev)
 {
 	// Wheel rotation by one notch results in a delta() of 120 (see
 	// documentation of QWheelEvent)
+	// But first we have to ignore horizontal scroll events.
+#if QT_VERSION < 0x050000
+	if (ev->orientation() == Qt::Horizontal) {
+		ev->accept();
+		return;
+	}
 	double const delta = ev->delta() / 120.0;
+#else
+	QPoint const aDelta = ev->angleDelta();
+	// skip horizontal wheel event
+	if (abs(aDelta.x()) > abs(aDelta.y())) {
+		ev->accept();
+		return;
+	}
+	double const delta = aDelta.y() / 120.0;
+#endif
+
 	bool zoom = false;
 	switch (lyxrc.scroll_wheel_zoom) {
 	case LyXRC::SCROLL_WHEEL_ZOOM_CTRL:
diff --git a/status.23x b/status.23x
index d70960c8a3..65735fe2b6 100644
--- a/status.23x
+++ b/status.23x
@@ -106,6 +106,8 @@ What's new
 
 - Fix conversion of captions from LyX 2.0 documents.
 
+- Ignore horizontal wheel scrolling in work area (bug 11257).
+
 
 
 * USER INTERFACE