Savestate browser: delete the screenshot and name file along with the state

Deleting a savestate from the savedata screen goes through GameInfo::Delete,
not SaveState::DeleteSlot, and it only knew about the .jpg - so the slot's
.name.txt was left behind with nothing to belong to.

Rather than teach the UI the naming scheme a third time, SaveState now answers
what sits beside a state.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

Core/SaveState.cpp

@@ -735,6 +735,21 @@ int g_screenshotFailures;
 		Rescan(gamePrefix);
 	}
 
+	std::vector<Path> GetCompanionFilePaths(const Path &statePath) {
+		const std::string stateExtension = std::string(".") + STATE_EXTENSION;
+		// A path that isn't a savestate yields nothing, which WithReplacedExtension now tells us
+		// rather than handing back the path itself. An undo state does work, and correctly:
+		// "x.undo.ppst" maps onto "x.undo.jpg".
+		std::vector<Path> paths;
+		for (const char *extension : { SCREENSHOT_EXTENSION, NAME_EXTENSION }) {
+			Path companion;
+			if (statePath.WithReplacedExtension(stateExtension, std::string(".") + extension, &companion)) {
+				paths.push_back(companion);
+			}
+		}
+		return paths;
+	}
+
 	std::vector<Operation> Flush() {
 		std::lock_guard<std::mutex> guard(mutex);
 		std::vector<Operation> copy = g_pendingOperations;

Core/SaveState.h

@@ -79,6 +79,12 @@ namespace SaveState {
 	Path GenerateSaveSlotPath(std::string_view gamePrefix, int slot, const char *extension);
 	void SetSlotCustomName(std::string_view gamePrefix, int slot, std::string_view newName);
 
+	// The files that sit beside a savestate and mean nothing without it: its screenshot, and the
+	// slot's custom name if it was given one. Anything deleting a .ppst from outside DeleteSlot -
+	// the savestate browser does exactly that - has to take these along, or they stay in the
+	// savestate folder for good. Returns nothing for a path that isn't a savestate.
+	std::vector<Path> GetCompanionFilePaths(const Path &statePath);
+
 	std::string GetTitle(const Path &filename);
 
 	// Load the specified file into the current state (async.)

UI/GameInfoCache.cpp

@@ -170,9 +170,11 @@ bool GameInfo::Delete() {
 			const Path &ppstPath = filePath_;
 			INFO_LOG(Log::System, "Deleting file %s", ppstPath.c_str());
 			MoveFileToTrashOrDelete(ppstPath);
-			Path screenshotPath;
-			if (filePath_.WithReplacedExtension(".ppst", ".jpg", &screenshotPath) && File::Exists(screenshotPath)) {
-				MoveFileToTrashOrDelete(screenshotPath);
+			// The screenshot and the slot's custom name are no use without the state itself.
+			for (const Path &companion : SaveState::GetCompanionFilePaths(ppstPath)) {
+				if (File::Exists(companion)) {
+					MoveFileToTrashOrDelete(companion);
+				}
 			}
 			return true;
 		}