[Feature request] Ability to "bookmark" lines

[gloomytrousers]

Ability to "bookmark" lines - e.g. highlight them with a coloured mark next to the line number. Ability to toggle on/off in various ways:

• via click on line number or keypress (e.g. Ctrl+F2 is common in other editors)
• via Find - bookmark matching lines
• invert all current bookmarks

As well as being useful visual cues, the bookmarks can be used for:

• Navigation - jump to next and previous bookmark, via keypress (e.g. F2 and Shift+F2) or menu item
• Replace only on bookmarked lines

[dail8859]

via Find - bookmark matching lines
Replace only on bookmarked lines

Though very possible these two will take some more time. The Find/Replace dialog is a bit of a pain to try to implement cleanly from a GUI perspective.

The other bullet points I have working and will push those changes hopefully today.

And just to be clear, you can already click on the bookmark margin and bookmark lines, but the other features are definitely very useful.

[gloomytrousers]

Wow, thanks, that was quick!

[dail8859]

Closing for now since most of the features are implemented. The ones regarding find/replace functionality are definitely desireable but those will get rolled into a good revamp of the current Find/Replace dialog, since currently the code is a bit messy.

The commit adds several menu options: