Regression: all mouse buttons detected as RMB

[ttcoder]

Might be a fluke in the recent refactorings:

• in any Tracker window (Desktop included), the left mouse button opens the contextual menu, just like clicking the right mouse button would. So no way to double-click any more e.g.
• oddly, the "Mouse" preflet is affected too, with regard to the visual feedback: only the digit "2" is ever highlighted; maybe it shares code with Tracker ?
• apps e.g. WebPositive are not affected: the RMB brings up the menu, the LMB selects text. No problem.

hrev47753