Fix issues with pre-encoded param names not being properly decoded (#11199)

Author: brophdawg11

.changeset/fifty-pugs-boil.md

@@ -0,0 +1,6 @@
+---
+"react-router": patch
+"@remix-run/router": patch
+---
+
+Fix encoding/decoding issues with pre-encoded dynamic parameter values

package.json

@@ -119,10 +119,10 @@
       "none": "50.4 kB"
     },
     "packages/react-router/dist/react-router.production.min.js": {
-      "none": "14.7 kB"
+      "none": "14.73 kB"
     },
     "packages/react-router/dist/umd/react-router.production.min.js": {
-      "none": "17.1 kB"
+      "none": "17.2 kB"
     },
     "packages/react-router-dom/dist/react-router-dom.production.min.js": {
       "none": "17.0 kB"

packages/react-router-dom-v5-compat/lib/components.tsx

@@ -96,6 +96,10 @@ export function StaticRouter({
     },
     encodeLocation(to: To) {
       let href = typeof to === "string" ? to : createPath(to);
+      // Treating this as a full URL will strip any trailing spaces so we need to
+      // pre-encode them since they might be part of a matching splat param from
+      // an ancestor route
+      href = href.replace(/ $/, "%20");
       let encoded = ABSOLUTE_URL_REGEX.test(href)
         ? new URL(href)
         : new URL(href, "http://localhost");