Add "sticky lines" feature #12
Description
This is the first of three issues. The goal is to make it so I don't need Notepad++ anymore and can use the TFC window instead. They probably are all for the v2 version of TFC.
Issue 1: Add "sticky lines" feature.
If a line begins with "###" make that line always stay at the top of the screen. This could be useful for things like edgework or FMN calculations, etc.
If I were implementing the feature, I'd keep the line number what it is and just display that line at the top.
If the user is editing one of these lines and hits return, automatically insert "###" so that the new line naturally goes below the line before it. This would be useful for cases when the FMN grows too wide for one line entry and they want to continue it on a separate line.
If the user gets rid of the "###", then... hmmm... not sure what is best to do. Probably jump down below where the line is in the flow of normal lines. Hopefully they don't do this often.