Auto-completion should merge the selected proposal with the current line

[Zylann]

Godot 3.1 alpha2 and before

Sometimes when I use auto-complete, it occurs that I'm at a position where previous code exists after my cursor. When I select a completion proposal, it just appends the result to my cursor, which causes temporary errors and I have to delete the code that followed manually. In VisualStudio, Intellisense actually merges the following code, so that you don't need to do this extra deletion.

Examples:
I renamed or moved a node, so I need to change its path in code. The following scenario then happens:
I place my cursor in the path, press Ctrl+Space to get suggestions (or just start typing a name, either way)

I choose the proposal, and... I end up with this.

I then have to correct it myself to go back to correct code...

It would be nice if the time gained by autocomplete didnt get lost in this^^

The same happens for member access. Let's say I want to replace the call to a function by another of a similar name. I also get auto-completion proposals:

But as soon as I choose one, I end up with this:

And you guess I have to move the cursor to correct this out manually.

WDYT?