mGUI: Load parent directory if last used directory is missing (fixes #3379)

CHANGES

@@ -22,6 +22,7 @@ Other fixes:
  - GBA: Fix getting game info for multiboot ROMs
  - GBA Core: Fix booting into BIOS when skip BIOS is enabled
  - GBA Hardware: Fix loading states unconditionally overwriting GPIO memory
+ - mGUI: Load parent directory if last used directory is missing (fixes mgba.io/i/3379)
  - Qt: Fix savestate preview sizes with different scales (fixes mgba.io/i/2560)
  - Qt: Fix potential crash when configuring shortcuts
 Misc:

include/mgba-util/gui/menu.h

@@ -10,9 +10,12 @@
 
 CXX_GUARD_START
 
+#include <mgba/core/log.h>
 #include <mgba-util/gui.h>
 #include <mgba-util/vector.h>
 
+mLOG_DECLARE_CATEGORY(GUI_MENU);
+
 #define GUI_V_V (struct GUIVariant) { .type = GUI_VARIANT_VOID }
 #define GUI_V_U(U) (struct GUIVariant) { .type = GUI_VARIANT_UNSIGNED, .v.u = (U) }
 #define GUI_V_I(I) (struct GUIVariant) { .type = GUI_VARIANT_INT, .v.i = (I) }

src/util/gui/file-select.c

@@ -163,7 +163,16 @@ bool GUISelectFile(struct GUIParams* params, char* outPath, size_t outLen, bool
 		.subtitle = params->currentPath,
 	};
 	GUIMenuItemListInit(&menu.items, 0);
-	_refreshDirectory(params, params->currentPath, &menu.items, filterName, filterContents, preselect);
+	while (true) {
+		if (_refreshDirectory(params, params->currentPath, &menu.items, filterName, filterContents, preselect)) {
+			break;
+		}
+		if (strncmp(params->currentPath, params->basePath, PATH_MAX) == 0 || !params->currentPath[0]) {
+			mLOG(GUI_MENU, ERROR, "Failed to load base directory");
+			return false;
+		}
+		_upDirectory(params->currentPath);
+	}
 	menu.index = params->fileIndex;
 
 	while (true) {

src/util/gui/menu.c

@@ -17,6 +17,8 @@
 DEFINE_VECTOR(GUIMenuItemList, struct GUIMenuItem);
 DEFINE_VECTOR(GUIMenuSavedList, struct GUIMenuSavedState);
 
+mLOG_DEFINE_CATEGORY(GUI_MENU, "GUI Menu", "gui.menu");
+
 void _itemNext(struct GUIMenuItem* item, bool wrap) {
 	if (wrap || item->state < item->nStates - 1) {
 		unsigned oldState = item->state;