Select all with Ctrl+A in RunCollectionView

[abeham]

Selecting all runs, e.g. to copy them in a new run collection is so tedious

[abeham]

r15645: implemented select all

[mkommend]

Reviewed r15645 and the changes look good.

The only minor concern I have is that for each selected item the selected index changed event is triggered and the according handler executed. However, I have tested it with rather small RunCollections (<50 runs) and there it was not an issue. What do you think about it? Should we deregister the event handler and after the update is finished register it again?

[abeham]

I tested this with a run collection containing 12,000 runs and did not notice a performance issue. The only effect is that when nothing is selected the first change of Selected to true causes the viewhost to show the item until the second item is selected in which case the viewhost will be blank again. This is very short though. If you think this is undesired I would propose to suppress the selectedindexchanged event handler with a bool property. Changing event handlers could have side effects in case an update was made to the run collection from another thread while select all was in progress.

[mkommend]

Fine by me.

[abeham]

r15717: merged to stable