Public bug reported:

The navigation triangle code for keeping a submenu open when the mouse
is moving diagonally toward it is broken due to incorrect rounding.

This was reported upstream at:
https://bugzilla.gnome.org/show_bug.cgi?id=710388

The attached patch (also submitted upstream) rounds the cursor location
when calculating the navigation triangle bounds.

** Affects: gtk+3.0 (Ubuntu)
     Importance: Undecided
         Status: New

** Patch added: "Fix for navigation triangle bug"
   
https://bugs.launchpad.net/bugs/1641867/+attachment/4777560/+files/submenu_navigation_region_fix.patch

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https://bugs.launchpad.net/bugs/1641867

Title:
  GtkMenu: Submenu navigation triangle doesn't work

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