• Minimap (overview map) was removed in gedit 3.36
• This plugin allows you to have minimap
• Optional: display the minimap on the left

mkdir -p ~/.local/share/gedit/plugins/
cd ~/.local/share/gedit/plugins/
git clone https://github.com/johnfactotum/gedit-restore-minimap.git restore-minimap

To use Gnome Builder's block font, which makes the minimap looks so much better that I wonder why they haven't bundled the font with gtksourceview itself, copy BuilderBlocks.ttf to ~/.local/share/fonts.

• It breaks when an info bar is displayed
• It'd be nice if the minimap can use Gnome Builder's block font without having to install it, but I couldn't figure out how

• Restore Overlay Scrolling - plugin for restoring overlay scrolling, which was also removed in gedit 3.36
• Restore Zen - plugin for restoring zen mode, which was also removed in gedit 3.36
• "Minimap and overlay scrolling disappeared in 3.36" (discussion of the issue on gedit's issue tracker)