Indexed markers (Edges.markers) were always drawn with the navigation glyph,
so a plugin couldn't tell its marker kinds apart. A [[contributes.markerIcons]]
entry can now claim them by key prefix (`markers`), with an optional
`tooltip` shown above the targets. The host matches the longest prefix and
sends the declaration id with each marker; the editor resolves the icon and
the translated tooltip from the projected declaration. Manifest only, under
the existing API 1.3 gate of markerIcons.
Closes#2194
Plugin API 1.2 gains an optional document-indexer export (plugin-indexing world). A plugin returns per document the keys it defines and refers to, aliases between key prefixes and gutter markers; the host indexes a trusted project in cancellable background batches, keeps the project-wide graph, and answers Go to Declaration / Ctrl-click and multi-target gutter markers from memory without calling the plugin again. Edits and file changes invalidate the affected entries; reload, disable or a failing runtime drops the plugin's graph.
The interface is limited to cross-file associations: icons chosen by file content and embedded-language regions are separate concerns for later interfaces. The plugin navigation choosers' titles are translated.
Co-authored-by: qjlqyf <[email protected]>
Pedro Pessoa
qiaojianlong