virtcol() fails to deliver the correct screen column if showbreak is set to a
value other than "" and wrap is on, i.e. it doesn't take into account the
length of the string that showbreak is set to.
To reproduce:
1) Start a "bare" gvim with a text containing a long line.
2) :set nowrap
3) Position the cursor at the beginning of a word towards the end of the line.
4) :echo virtcol(".")
5) :set wrap " Make sure the cursor is in a 'wrapped' line
6) :echo virtcol(".") " Returns the same value
7) :set showbreak=(-->)
8) :echo virtcol(".") " Will return a distinct value
col(".")'s return value would not change, but it's not Unicode (UTF-8) proof...
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