@Mackraken
I’ve isolated the Intellisense function from your add-on and updated it to 2.8+ so it could be included in this collection of Text Editor add-ons: https://blenderartists.org/t/how-would-you-show-some-love-for-the-blender-text-editor/1163857 I hope that’s ok?
Download of the 2.8+ version: https://github.com/tin2tin/Intellisense_for_Blender_Text_Editor