disk change opens oposite panel location

src/main/java/cz/kamma/kfmanager/ui/FilePanel.java

@@ -23,6 +23,7 @@ public class FilePanel extends JPanel {
     private cz.kamma.kfmanager.config.AppConfig appConfig;
     private Runnable onDirectoryChangedAll;
     private java.util.function.Consumer<JTable> onTableCreated;
+    private java.util.function.Function<File, File> driveSelectionTargetResolver;
     private boolean ignoreComboActions = false;
     private boolean active = false;
     
@@ -39,6 +40,10 @@ public class FilePanel extends JPanel {
         this.onTableCreated = callback;
     }
 
+    public void setDriveSelectionTargetResolver(java.util.function.Function<File, File> resolver) {
+        this.driveSelectionTargetResolver = resolver;
+    }
+
     /** Start inline rename on the currently selected tab/table. */
     public void startInlineRename() {
         FilePanelTab tab = getCurrentTab();
@@ -117,7 +122,19 @@ public class FilePanel extends JPanel {
             if (selObj instanceof File sel) {
                 FilePanelTab currentTab = getCurrentTab();
                 if (currentTab != null) {
-                    currentTab.loadDirectory(sel);
+                    File targetDirectory = sel;
+                    if (driveSelectionTargetResolver != null) {
+                        try {
+                            File resolved = driveSelectionTargetResolver.apply(sel);
+                            if (resolved != null && resolved.exists() && resolved.isDirectory() && isWithinSelectedDrive(resolved, sel)) {
+                                targetDirectory = resolved;
+                            }
+                        } catch (Exception ignore) {
+                            // fall back to selected drive root
+                        }
+                    }
+
+                    currentTab.loadDirectory(targetDirectory);
                     SwingUtilities.invokeLater(() -> {
                         try { currentTab.getFileTable().requestFocusInWindow(); } catch (Exception ignore) {}
                     });
@@ -238,6 +255,25 @@ public class FilePanel extends JPanel {
         }
     }
 
+    private boolean isWithinSelectedDrive(File directory, File selectedDrive) {
+        try {
+            java.nio.file.Path dirPath = directory.toPath().toAbsolutePath().normalize();
+            java.nio.file.Path selectedPath = selectedDrive.toPath().toAbsolutePath().normalize();
+            if (dirPath.startsWith(selectedPath)) {
+                return true;
+            }
+
+            java.nio.file.Path dirRoot = dirPath.getRoot();
+            java.nio.file.Path selectedRoot = selectedPath.getRoot();
+            return dirRoot != null
+                    && selectedRoot != null
+                    && dirRoot.equals(selectedRoot)
+                    && selectedPath.equals(selectedRoot);
+        } catch (Exception ex) {
+            return false;
+        }
+    }
+
     /**
      * Show the drive dropdown popup and focus it.
      */

src/main/java/cz/kamma/kfmanager/ui/MainWindow.java

@@ -144,11 +144,14 @@ public class MainWindow extends JFrame {
     // Provide a callback so tabs inside the panel can request switching panels with TAB
     rightPanel.setSwitchPanelCallback(() -> switchPanelsFromChild());
     rightPanel.setOnDirectoryChangedAll(() -> updateCommandLinePrompt());
-    rightPanel.setOnTableCreated(table -> {
+        rightPanel.setOnTableCreated(table -> {
         setupFileTable(table, rightPanel);
     });
     setupFileTable(rightPanel.getFileTable(), rightPanel);
 
+        leftPanel.setDriveSelectionTargetResolver(selectedDrive -> getPreferredDirectoryFromOppositePanel(selectedDrive, rightPanel));
+        rightPanel.setDriveSelectionTargetResolver(selectedDrive -> getPreferredDirectoryFromOppositePanel(selectedDrive, leftPanel));
+        
     // Load and set ViewMode for right panel
         try {
             ViewMode rightViewMode = ViewMode.valueOf(config.getRightPanelViewMode());
@@ -2312,6 +2315,33 @@ public class MainWindow extends JFrame {
         }
     }
 
+    private File getPreferredDirectoryFromOppositePanel(File selectedDrive, FilePanel oppositePanel) {
+        if (selectedDrive == null || oppositePanel == null) return selectedDrive;
+        File oppositeDirectory = oppositePanel.getCurrentDirectory();
+        if (oppositeDirectory == null || !oppositeDirectory.exists() || !oppositeDirectory.isDirectory()) {
+            return selectedDrive;
+        }
+        return isWithinSelectedDrive(oppositeDirectory, selectedDrive) ? oppositeDirectory : selectedDrive;
+    }
+
+    private boolean isWithinSelectedDrive(File directory, File selectedDrive) {
+        try {
+            java.nio.file.Path dirPath = directory.toPath().toAbsolutePath().normalize();
+            java.nio.file.Path selectedPath = selectedDrive.toPath().toAbsolutePath().normalize();
+            if (dirPath.startsWith(selectedPath)) {
+                return true;
+            }
+            java.nio.file.Path dirRoot = dirPath.getRoot();
+            java.nio.file.Path selectedRoot = selectedPath.getRoot();
+            return dirRoot != null
+                    && selectedRoot != null
+                    && dirRoot.equals(selectedRoot)
+                    && selectedPath.equals(selectedRoot);
+        } catch (Exception ex) {
+            return false;
+        }
+    }
+    
     /**
      * Set the view mode for the active panel
      */