Fixes #83410 - FsProviders causing invalid links

When more than one ext host FileSystemProvider was registered the linkification for the scheme of the provider was causing links to get incorrectly found because the link state machine was setting up the states incorrectly

Should hopefully fix MicrosoftDocs/vsonline#28 as well

src/vs/workbench/api/common/extHostFileSystem.ts

@@ -44,6 +44,7 @@ class FsLinkProvider {
 			const edges: Edge[] = [];
 			let prevScheme: string | undefined;
 			let prevState: State;
+			let lastState = State.LastKnownState;
 			let nextState = State.LastKnownState;
 			for (const scheme of schemes) {
 
@@ -60,6 +61,8 @@ class FsLinkProvider {
 					// keep creating new (next) states until the
 					// end (and the BeforeColon-state) is reached
 					if (pos + 1 === scheme.length) {
+						// Save the last state here, because we need to continue for the next scheme
+						lastState = nextState;
 						nextState = State.BeforeColon;
 					} else {
 						nextState += 1;
@@ -70,6 +73,8 @@ class FsLinkProvider {
 				}
 
 				prevScheme = scheme;
+				// Restore the last state
+				nextState = lastState;
 			}
 
 			// all link must match this pattern `<scheme>:/<more>`