1. remove unnecessary events from MainViewModel 2. remove usage of Obsolete api (show, hide etc) 3. fix space problem in #660 4. part of #486 5. fix up/down key bug introduced in 92b7ca6a1bafd254e39ee92812ff691906cd85c1 6. fix #678
1. introduce variable 2. part of #389 3. refactoring program suffix in program plugin 4. 全局变量一时爽,代码重构火葬场