winex11.drv: Interpret mouse 6/7 as horiz scroll.

X11 Mouse buttons 6 and 7 were set to translate into browser
back/forward button events. However, this is based on an old convention
where buttons 6 and 7 could either mean horizontal scroll or browser
back/forward. Nowadays, 6 and 7 solely mean horizontal scroll, 8 and 9
being used for back/forward. In addition, the wide adoption of
two-finger two-dimensional scrolling on laptop trackpads since this code
was written has meant that back/forward events may be generated
unintentionally, which can be very disruptive when using tools such as
web browsers.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=49142
Signed-off-by: Murray Colpman <muzer@tim32.org>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/winex11.drv/mouse.c

@@ -74,8 +74,8 @@ static const UINT button_down_flags[NB_BUTTONS] =
     MOUSEEVENTF_RIGHTDOWN,
     MOUSEEVENTF_WHEEL,
     MOUSEEVENTF_WHEEL,
-    MOUSEEVENTF_XDOWN,  /* FIXME: horizontal wheel */
-    MOUSEEVENTF_XDOWN,
+    MOUSEEVENTF_HWHEEL,
+    MOUSEEVENTF_HWHEEL,
     MOUSEEVENTF_XDOWN,
     MOUSEEVENTF_XDOWN
 };
@@ -87,8 +87,8 @@ static const UINT button_up_flags[NB_BUTTONS] =
     MOUSEEVENTF_RIGHTUP,
     0,
     0,
-    MOUSEEVENTF_XUP,
-    MOUSEEVENTF_XUP,
+    0,
+    0,
     MOUSEEVENTF_XUP,
     MOUSEEVENTF_XUP
 };
@@ -100,8 +100,8 @@ static const UINT button_down_data[NB_BUTTONS] =
     0,
     WHEEL_DELTA,
     -WHEEL_DELTA,
-    XBUTTON1,
-    XBUTTON2,
+    -WHEEL_DELTA,
+    WHEEL_DELTA,
     XBUTTON1,
     XBUTTON2
 };
@@ -113,8 +113,8 @@ static const UINT button_up_data[NB_BUTTONS] =
     0,
     0,
     0,
-    XBUTTON1,
-    XBUTTON2,
+    0,
+    0,
     XBUTTON1,
     XBUTTON2
 };