LedgerAlign: correct when account name is too long

When account names are too long, LedgerAlign was currupting the aligned
lines. This commit ensures that:

- In any case, if the account name is longer than the aligning column,
  the line is not corrupted and the amount is put at the end of the line
  (instead of putting it in the middle of the account name)

- In any case, it ensures that there is a minimum of 2 spaces between
  the account name and the amount.

autoload/ledger.vim

@@ -333,9 +333,11 @@ function! s:findall(text, rx)
 endf
 
 " Move the cursor to the specified column, filling the line with spaces if necessary.
-function! s:goto_col(pos)
-  exec "normal!" a:pos . "|"
-  let diff = a:pos - virtcol('.')
+" Ensure that at least min_spaces are added, and go to the end of the line if
+" the line is already too long
+function! s:goto_col(pos, min_spaces)
+  exec "normal!" "$"
+  let diff = max([a:min_spaces, a:pos - virtcol('.')])
   if diff > 0 | exec "normal!" diff . "a " | endif
 endf
 
@@ -384,11 +386,10 @@ function! ledger#align_commodity()
     endif
     " Go to the column that allows us to align the decimal separator at g:ledger_align_at:
     if pos > 0
-      call s:goto_col(g:ledger_align_at - pos - 1)
+      call s:goto_col(g:ledger_align_at - pos - 1, 2)
     else
-      call s:goto_col(g:ledger_align_at - strdisplaywidth(rhs) - 2)
-    endif
-    " Append the part of the line that was previously removed:
+      call s:goto_col(g:ledger_align_at - strdisplaywidth(rhs) - 2, 2)
+    endif " Append the part of the line that was previously removed:
     exe 'normal! a' . rhs
   endif
 endf!
@@ -404,11 +405,11 @@ function! ledger#align_amount_at_cursor()
   endif
   " Paste text at the correct column and append/prepend default commodity:
   if g:ledger_commodity_before
-    call s:goto_col(g:ledger_align_at - pos - len(g:ledger_default_commodity) - len(g:ledger_commodity_sep) - 1)
+    call s:goto_col(g:ledger_align_at - pos - len(g:ledger_default_commodity) - len(g:ledger_commodity_sep) - 1, 2)
     exe 'normal! a' . g:ledger_default_commodity . g:ledger_commodity_sep
     normal! p
   else
-    call s:goto_col(g:ledger_align_at - pos - 1)
+    call s:goto_col(g:ledger_align_at - pos - 1, 2)
     exe 'normal! pa' . g:ledger_commodity_sep . g:ledger_default_commodity
   endif
 endf!