Add file preview functionality to filepicker #88
Description
The filepicker currently displays 3 columns.
Following functionality would be great:
- Toggle between single and 3 columns mode
- In 1 column mode file preview should be enabled for supported files (DV80, later also for basic/xbasic files)
Technical details:
- To avoid slowdown, file preview could be handled via a delayed task (e.g. 0,3 seconds) when file up/down is done. That is sufficient to kill the task before it kicks in when file up/down is done in between.