Zotero.SearchQuery turns a query like `by:smith after:2020 tag:"to read"
crispr` or `creator is smith and (tag is foo or bar)` into a
Zotero.Search, matching whatever text is left over using the current
search mode. Anything that doesn't look like a clause is free text, so a
DOI or a title with a colon in it is matched literally.
The search box syntax-highlights the parts of recognized conditions and
offers autocomplete for condition names, for the values of conditions
that have a fixed set of them (like item type), and for tags and
creators from the selected libraries.
The menu icon element is now an <html:img> that renders the 'image'
attribute or 'content: var(--menuitem-icon)', and 'list-style-image' is
ignored, so iconic menuitems showed broken-image placeholders on
Windows and Linux. list-style-image is kept for native macOS menus,
which still read it.
Bug 2008041 made disabled, checked, hidden, collapsed, and selected
boolean attributes, so their value is empty and [disabled="true"] no
longer matches. Nothing sets any of them to "false", so matching on
presence alone is equivalent.
The toolkit's default menuitem padding is em-based, so it balloons
with the UI font size in menulist dropdowns (e.g., the item type
menu), which inherit that font, forcing long lists to scroll. macOS
uses a fixed value on all menus and is unaffected. Match that on
Windows and Linux, slightly roomier, so every menu stays compact
regardless of font size.
https://forums.zotero.org/discussion/132797/request-for-compact-view-in-dropdown-menus
Set focusring on the child hbox, instead of the actual tab.
The hbox is the element with visibly rounded corners,
so this way the focus-ring will have the right shape.
Fixes: #4744
