added directory navigation support to launcher 'Select' button

docs/index.html

@@ -629,7 +629,7 @@
   The tables below show the default settings.<br/><br/>
 
   Note: All key names are based on the US QWERTY <a href="https://en.wikipedia.org/wiki/Keyboard_layout">
-  keyboard layout.</a>. If you use a different layout some keys may differ. You can use the
+  keyboard layout</a>. If you use a different layout some keys may differ. You can use the
   following layout image as reference where to find the US keys on your keyboard.
   </p>
   <p><img src="graphics/qwertz.png"></p>

src/gui/FileListWidget.hxx

@@ -77,6 +77,8 @@ class FileListWidget : public StringListWidget
 
     /** Select parent directory (if applicable) */
     void selectParent();
+    /** Descend into currently selected directory */
+    void selectDirectory();
 
     /** Reload current location (file or directory) */
     void reload();
@@ -98,9 +100,6 @@ class FileListWidget : public StringListWidget
     /** Very similar to setDirectory(), but also updates the history */
     void setLocation(const FilesystemNode& node, const string& select);
 
-    /** Descend into currently selected directory */
-    void selectDirectory();
-
     bool handleText(char text) override;
     void handleCommand(CommandSender* sender, int cmd, int data, int id) override;
 

src/gui/LauncherDialog.cxx

@@ -287,7 +287,7 @@ LauncherDialog::LauncherDialog(OSystem& osystem, DialogContainer& parent,
                                      "Select", kLoadROMCmd);
     wid.push_back(myStartButton);
   #endif
-    myStartButton->setToolTip("Start emulation of selected ROM.");
+    myStartButton->setToolTip("Start emulation of selected ROM\nor switch to selected directory.");
   }
   if(myUseMinimalUI) // Highlight 'Rom Listing'
     mySelectedItem = 0;
@@ -789,6 +789,15 @@ void LauncherDialog::handleCommand(CommandSender* sender, int cmd,
       break;
 
     case kLoadROMCmd:
+      if(myList->selected().isDirectory())
+      {
+        if(myList->selected().getName() == " [..]")
+          myList->selectParent();
+        else
+          myList->selectDirectory();
+        break;
+      }
+      [[fallthrough]];
     case FileListWidget::ItemActivated:
       saveConfig();
       loadRom();