The problem is that you cannot cancel the page navigation in the widget,
not even by using simple JavaScript (unbeforeunload).
Find below instead a way to "revert" the navigation. If you don't want to
hide the widget you can similarly use two widgets and change their layer.
Or you can show a snapshot of the current page while hiding the widget
that already shows the new page.
local flc="forums.livecode.com", qURL
on browserNavigateComplete pUrl
if not (pURL contains flc) then
answer "Leave the forum?" with "yes" or "no"
if it is "no" then
send "resetURL" to me in 3 ticks
else show widget 1
end if
end browserNavigateComplete
on browserNavigateBegin pUrl
if pURL contains flc then
put the url of widget 1 into qURL
else hide widget 1
end browserNavigateBegin
on resetURL
set the url of widget 1 to qURL
show widget 1
end resetURL
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