Vertical Tabs -- Prevent movement when opening

[sleepy_will]

Currently, when you mouse-over the icons of the vertical tab bar the menu opens.  This is great normally.  But when other elements exist which result in the tabs shifting position after being opened - this becomes a problem.  You can click where you thought a tab would be only to end up selecting an adjacent tab.

A perfect example of this would be when you have a split view.  When closed, vertical space for two items (the two splits) is reserved.  But once expanded, vertical space reverts to that of a single item.  When moving the mouse to open a tab, the tab you were aiming for jumps away from the expected position right as the tabs are expanding.  Note that this only applies to the tabs below the split-view.

Another time this is an issue, albeit a less significant one, is when the bookmark bar switches between enabled and disabled.  Switching between tabs with different menu bars enabled results in the active tab moving so that it is no longer under your mouse cursor.  This shouldn't happen - at least not immediately.  Add a delay or at least prevent tab movement so long as the mouse is over the tab bar.  The widgets people are aiming for should not move while being utilized.

[Jon]

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