Key TakeawaysTesla shares gained ground in extended trading on Wednesday as optimism over the automaker's self-driving outlook trumped fourth-quarter results that came in below Wall Street’s expectations.The price looks sets to gap above the top trendline of a flag pattern on Thursday in a move that could resume the stock’s upward momentum.Bars pattern analysis, which takes the stock’s trending move from October to December and overlays it from the flag pattern’s lower trendline, projects a longer-term bull ...