fixed scrolling lists with the mousewheel for some X11 windowmanagers.

some WMs not only send 'crossing' events when really moving from one
window to another, but also when mousewheeling.
distinguishing those events 'mode' property fixed this.

brecht++ for figuring out the details.

diff --git a/intern/ghost/intern/GHOST_SystemX11.cpp b/intern/ghost/intern/GHOST_SystemX11.cpp
index 378bc6b90beeb56f068a61d5a48ae495c0ca1602..b44f2b1822507bab2fd46c3d5678718d01d683d6 100644 (file)
--- a/intern/ghost/intern/GHOST_SystemX11.cpp
+++ b/intern/ghost/intern/GHOST_SystemX11.cpp
@@ -700,19 +700,24 @@ GHOST_SystemX11::processEvent(XEvent *xe)
                case EnterNotify:
                case LeaveNotify:
                {
-                       // XCrossingEvents pointer leave enter window.
-                       // also do cursor move here, MotionNotify only
-                       // happens when motion starts & ends inside window
+                       /* XCrossingEvents pointer leave enter window.
+                          also do cursor move here, MotionNotify only
+                          happens when motion starts & ends inside window.
+                          we only do moves when the crossing mode is 'normal'
+                          (really crossing between windows) since some windowmanagers
+                          also send grab/ungrab crossings for mousewheel events.
+                       */
                        XCrossingEvent &xce = xe->xcrossing;
-                       
-                       g_event = new 
-                       GHOST_EventCursor(
-                               getMilliSeconds(),
-                               GHOST_kEventCursorMove,
-                               window,
-                               xce.x_root,
-                               xce.y_root
-                       );
+                       if( xce.mode == NotifyNormal ) {
+                               g_event = new 
+                               GHOST_EventCursor(
+                                       getMilliSeconds(),
+                                       GHOST_kEventCursorMove,
+                                       window,
+                                       xce.x_root,
+                                       xce.y_root
+                               );
+                       }
                        break;
                }
                case MapNotify: