Handle filtered READ events
6cb4ccf4d8db
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Description

Handle filtered READ events

* src/explorer-events: change hasSelection to only return true if a
                       mailitem was selected and
                       hasMailitemEventReadBeenCalled returns true
* src/gpgoladdin.h:   define new functions
                        markMailitemEventReadAsCalled
                        bool hasMailitemEventReadBeenCalled
* src/gpgoladdin.cpp: implement the new functions and a static var to
                      store the state.
* src/mail.h:         remove code for isVdPostponed
* src/map.cpp:        implement isVdPostponed and add more loging
* src/mailitem-events.cpp: Call markMailitemEventReadAsCalled on READ
* src/ribbon-callbacks.cpp: Add Tracepoint calls to hunt down crash

Add functions to set/read a flag gets set whenever the mailitem-event
READ event is called it indicated that no other addin like titus
filtered out the event. If set we invalidate the ribon on
SelectionChange events in explorer-events as we would normally do that
on handling the READ event.