fix(matcher): keep trailing slash on empty optional params

Fix #1357

Author: posva

__tests__/matcher/resolve.spec.ts

@@ -789,6 +789,14 @@ describe('RouterMatcher.resolve', () => {
         }
       )
     })
+
+    it('resolves root path with optional params', () => {
+      assertRecordMatch(
+        { path: '/:tab?', name: 'h', components },
+        { name: 'h' },
+        { name: 'h', path: '/', params: {} }
+      )
+    })
   })
 
   describe('LocationAsRelative', () => {

src/matcher/pathParserRanker.ts

@@ -250,9 +250,9 @@ export function tokensToParser(
           const text: string = Array.isArray(param) ? param.join('/') : param
           if (!text) {
             if (optional) {
-              // if we have more than one optional param like /:a?-static we
-              // don't need to care about the optional param
-              if (segment.length < 2) {
+              // if we have more than one optional param like /:a?-static and there are more segments, we don't need to
+              // care about the optional param
+              if (segment.length < 2 && segments.length > 1) {
                 // remove the last slash as we could be at the end
                 if (path.endsWith('/')) path = path.slice(0, -1)
                 // do not append a slash on the next iteration