From ae4cfaa9928b0832f53bad6c6a77c69a99b70153 Mon Sep 17 00:00:00 2001
From: heckflosse <heckflosse67@gmx.de>
Date: Mon, 26 Nov 2018 21:00:48 +0100
Subject: [PATCH] Using mouse wheel to zoom in sometimes zooms out, fixes #5036

---
 rtgui/cropwindow.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/rtgui/cropwindow.cc b/rtgui/cropwindow.cc
index 45372f1f5..6eac5e59d 100644
--- a/rtgui/cropwindow.cc
+++ b/rtgui/cropwindow.cc
@@ -275,6 +275,10 @@ void CropWindow::scroll (int state, GdkScrollDirection direction, int x, int y,
     } else {
         delta = deltaY;
     }
+    if (delta == 0.0 && direction == GDK_SCROLL_SMOOTH) {
+        // sometimes this case happens. To avoid zooming into the wrong direction in this case, we just do nothing
+        return;
+    }
     bool isUp = direction == GDK_SCROLL_UP || (direction == GDK_SCROLL_SMOOTH && delta < 0.0);
     if ((state & GDK_CONTROL_MASK) && onArea(ColorPicker, x, y)) {
         // resizing a color picker