Timeline: Can knock a current playing song out of place with drag and drop if current playing song has checkbox selected

there are two scenario now:

1. (major issue)

a. select the currently playing track
b. try to drag the second track up

Obtained result: dragging just the second track up will break the sequence of playing - as per Moving2ndTrack_UP.ogv

2. (GUI issue)
a. select the currently playing track
b. try to drag and drop any track to the upper position in the list

Obtained result:
dragging any track from beneath will make currently playing ( green ) track to disappear
after releasing the track, the sequence is not broken hopefully and everything is in place