--exclude-selectors marked a match as "ignored", the same as a bare
data-pagefind-ignore, so metadata and filters inside the match were still
collected. Excluding img.emoji, for example, still let the emoji become the
page's auto-detected image.
The status was also applied after the element had been processed. For a void
element such as <img> that is too late twice over: its metadata has already
been read, and the parser has already popped back to the parent, so the
status landed on the parent instead and wiped out the rest of the page.
Match the selectors in a handler registered ahead of the main element
handler, which now reads that flag and gives the node Excluded status up
front. The built-in REMOVE_SELECTORS (head, nav, footer, ...) keep the old
Ignored status, so metadata tagged inside them still counts.
Fixes#692
dualfroz
a36c86c90c