Vim9: continue in a catch clause doesn't take effect

[Yegappan Lakshmanan]

Hi,

A continue in a try-catch clause doesn't return control to
the beginning of a while loop as shown by the script
below:

=======================================
vim9script

g:Count = 0
def Test()
while g:Count < 2
echomsg "Before try"
try
echoerr 'Test'
catch
g:Count += 1
echomsg "Caught exception"
continue
endtry

echomsg "After try"
g:Count += 1
endwhile
enddef

Test()
=======================================

If you source the above script, the message "After try" will be printed
(which is not expected because of the continue in the catch clause).

- Yegappan

[Bram Moolenaar]

It's because :while is the very first command, instruction index is
zero, thus it looks like the jump index wasn't set. I'll add an offset
to make it work.

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