Fix handling of "Could not open input path" when calling c++filt (#13279)

* Fix handling of "Could not open input path" when calling c++filt

Author: sean-mcmanus

Extension/CHANGELOG.md

@@ -4,6 +4,7 @@
 ### Bug Fixes
 * Fix random IntelliSense process crashes on Linux/macOS when `C_Cpp.intelliSenseCacheSize` is > 0. [#12668](https://github.com/microsoft/vscode-cpptools/issues/12668)
 * Fix a crash when processing Copilot snippets.
+* Fix a crash when using Copilot hover.
 
 ## Version 1.24.0: February 11, 2025
 ### New Feature

Extension/src/LanguageServer/extension.ts

@@ -1224,7 +1224,7 @@ async function handleCrashFileRead(crashDirectory: string, crashFile: string, cr
             if (ret?.output === funcStr) {
                 ret = await util.spawnChildProcess(filtPath, [funcStr], undefined, true).catch(logAndReturn.undefined);
             }
-            if (ret !== undefined && ret.succeeded) {
+            if (ret !== undefined && ret.succeeded && !ret.output.startsWith("Could not open input file")) {
                 funcStr = ret.output;
                 funcStr = funcStr.replace(/std::(?:__1|__cxx11)/g, "std"); // simplify std namespaces.
                 funcStr = funcStr.replace(/std::basic_/g, "std::");