* Fixed Issue 78731

The error handler for OpenLinkOccurrence handled the case of 'invalid' or 'message', but the function returns an error of new Error('invalid') or new Error('missing') instead of 'invalid' or 'missing'. This causes the editor to throw an unhandled exception instead of a warning message. This fix checks for an err.message as well as err for 'invalid' or 'missing'

Fixes #78729

For #78973

Candidate fix for #78898

This reverts commit e8c6bfce.

[monaco] expose missing language providers

Diff: https://github.com/xtermjs/xterm.js/compare/30161c3...f3b9dc0

Changes:

- Fix cursor blink for non-block cursor in DOM renderer
- Remove applyAddon
- Re-enable buffer tests
- Fix dom -> canvas renderer not drawing viewport

Fixes #77559
Fixes #78882

fix microsoft/monaco-editor#1546 - expose registerDeclarationProvider
fix microsoft/monaco-editor#1547 - expose registerSelectionRangeProvider
Signed-off-by: NAnton Kosyakov <anton.kosyakov@typefox.io>

Fixes #78769