browser: derive support from surrounding versions

Assume a version with undefined support value will be the same as either its
predecessor or unsupported successor.

diff --git a/browser.plp b/browser.plp
index 863f806f1e6990eeaf15f4bdb1af626c26c840f3..7eaa669386c0fe63430e66d92b948795d4ac63b6 100644 (file)
--- a/browser.plp
+++ b/browser.plp
@@ -271,8 +271,10 @@ sub saybrowsercols {
                my $compare = (
                        !defined $ver ? undef :      # last column if nameless
                        ref $data ne 'HASH' ? 'u' :  # unsupported if no support hash
-                       $data->{$ver}                # known
-                       || 'u'                       # unsure unless oldest is unsupported
+                       $data->{$ver} // $prev       # known or inherit from predecessor
+                       // (grep { defined } @{$data}{ @{ $versions{$browser} } })[0]
+                          ~~ 'n' && 'n'             # first known version is unsupported
+                       || 'u'                       # unsure
                );
                unless (!defined $prev or $prev ~~ $compare) {
                        my $usage = sum(map { $canihas->{$browser}->{$_} } @span);