nimsuggest: more precise cursor tracking

tools/nimsuggest/tests/tdef1.nim

@@ -1,16 +0,0 @@
-discard """
-$nimsuggest --tester $file
->def $1
-def;;skProc;;tdef1.hello;;proc (): string{.noSideEffect, gcsafe, locks: 0.};;$file;;9;;5;;"Return hello";;100
->def $1
-def;;skProc;;tdef1.hello;;proc (): string{.noSideEffect, gcsafe, locks: 0.};;$file;;9;;5;;"Return hello";;100
-"""
-
-proc hello(): string =
-  ## Return hello
-  "Hello"
-
-hel#[!]#lo()
-
-# v uncompleted id for sug (13,2)
-he