fixed scroll panel on archive exit

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

@@ -65,6 +65,8 @@ public class FilePanelTab extends JPanel {
     // we can cleanup older temp directories when navigation changes.
     private Path currentArchiveTempDir = null;
     private File currentArchiveSourceFile = null;
+    private File archiveReturnDirectory = null;
+    private Point archiveReturnViewPosition = null;
     private boolean inlineRenameActive = false;
     private boolean active = false;
     private final Map<String, Long> changeTimestamps = new HashMap<>();
@@ -1397,6 +1399,7 @@ public class FilePanelTab extends JPanel {
     }
 
     public void showArchiveFile(File archive, String entryName) {
+        rememberArchiveReturnState(archive);
         Path temp = extractArchiveToTemp(archive);
         if (temp != null) {
             // Delete any previous temp dir if different
@@ -1408,6 +1411,11 @@ public class FilePanelTab extends JPanel {
             currentArchiveTempDir = temp;
             currentArchiveSourceFile = archive;
 
+            if (entryName == null || entryName.isBlank()) {
+                loadDirectory(temp.toFile(), true, true);
+                return;
+            }
+
             File targetFile = new File(temp.toFile(), entryName);
             File targetDir = targetFile.isDirectory() ? targetFile : targetFile.getParentFile();
             
@@ -1420,6 +1428,8 @@ public class FilePanelTab extends JPanel {
             } else {
                 loadDirectory(temp.toFile(), true, true);
             }
+        } else {
+            clearArchiveReturnState();
         }
     }
 
@@ -1494,6 +1504,7 @@ public class FilePanelTab extends JPanel {
             if (item.getName().equals("..")) {
                 navigateUp();
             } else if (FileOperations.isArchiveFile(item.getFile())) {
+                rememberArchiveReturnState(item.getFile());
                 Path temp = extractArchiveToTemp(item.getFile());
                 if (temp != null) {
                     // Delete any previous temp dir if different
@@ -1505,6 +1516,8 @@ public class FilePanelTab extends JPanel {
                     currentArchiveTempDir = temp;
                     currentArchiveSourceFile = item.getFile();
                     loadDirectory(temp.toFile());
+                } else {
+                    clearArchiveReturnState();
                 }
             } else if (item.isDirectory()) {
                 loadDirectory(item.getFile());
@@ -1633,6 +1646,7 @@ public class FilePanelTab extends JPanel {
         if (item.getName().equals("..")) {
             navigateUp();
         } else if (FileOperations.isArchiveFile(item.getFile())) {
+            rememberArchiveReturnState(item.getFile());
             Path temp = extractArchiveToTemp(item.getFile());
             if (temp != null) {
                 try {
@@ -1643,6 +1657,8 @@ public class FilePanelTab extends JPanel {
                 currentArchiveTempDir = temp;
                 currentArchiveSourceFile = item.getFile();
                 loadDirectory(temp.toFile(), true, true);
+            } else {
+                clearArchiveReturnState();
             }
         } else if (item.isDirectory()) {
             loadDirectory(item.getFile());
@@ -2007,10 +2023,17 @@ public class FilePanelTab extends JPanel {
                         deleteTempDirRecursively(currentArchiveTempDir);
                         currentArchiveTempDir = null;
                         currentArchiveSourceFile = null;
-                        loadDirectory(parent, false);
+                        loadDirectory(parent, false, true, () -> {
-                        
+                            // Restore original viewport position and keep focus on archive item.
-                        // Select the archive file we just left
+                            // In BRIEF mode some selection listeners may still run later, so apply once more on EDT tail.
-                        SwingUtilities.invokeLater(() -> selectItemByName(archiveName));
+                            restoreArchiveReturnPosition();
+                            selectItemByName(archiveName, true, false);
+                            SwingUtilities.invokeLater(() -> {
+                                restoreArchiveReturnPosition();
+                                selectItemByName(archiveName, true, false);
+                                clearArchiveReturnState();
+                            });
+                        });
                     }
                     return;
                 }
@@ -2032,6 +2055,10 @@ public class FilePanelTab extends JPanel {
     }
 
     public void selectItemByName(String name, boolean requestFocus) {
+        selectItemByName(name, requestFocus, true);
+    }
+
+    private void selectItemByName(String name, boolean requestFocus, boolean scrollToItem) {
         if (viewMode == ViewMode.BRIEF) {
             // Re-calculate layout if needed before searching to ensure current mapping
             if (tableModel.items.size() > 0 && (tableModel.briefColumns == 0 || tableModel.briefRowsPerColumn == 0)) {
@@ -2047,7 +2074,9 @@ public class FilePanelTab extends JPanel {
                     if (column < fileTable.getColumnCount()) {
                         briefCurrentColumn = column;
                         fileTable.setRowSelectionInterval(row, row);
+                        if (scrollToItem) {
                             fileTable.scrollRectToVisible(fileTable.getCellRect(row, column, true));
+                        }
                         fileTable.repaint();
                         if (requestFocus) {
                             fileTable.requestFocusInWindow();
@@ -2062,7 +2091,9 @@ public class FilePanelTab extends JPanel {
                 FileItem item = tableModel.getItem(i);
                 if (item != null && item.getName().equalsIgnoreCase(name)) {
                     fileTable.setRowSelectionInterval(i, i);
+                    if (scrollToItem) {
                         fileTable.scrollRectToVisible(fileTable.getCellRect(i, 0, true));
+                    }
                     if (requestFocus) {
                         fileTable.requestFocusInWindow();
                     }
@@ -2073,6 +2104,37 @@ public class FilePanelTab extends JPanel {
         }
     }
 
+    private void rememberArchiveReturnState(File archiveFile) {
+        if (archiveFile == null) return;
+        archiveReturnDirectory = archiveFile.getParentFile();
+        Rectangle visibleRect = fileTable.getVisibleRect();
+        archiveReturnViewPosition = (visibleRect != null) ? visibleRect.getLocation() : null;
+    }
+
+    private void restoreArchiveReturnPosition() {
+        if (archiveReturnViewPosition == null || archiveReturnDirectory == null || currentDirectory == null) return;
+        if (!currentDirectory.equals(archiveReturnDirectory)) return;
+
+        Point target = new Point(archiveReturnViewPosition);
+        if (fileTable.getParent() instanceof JViewport viewport) {
+            Dimension pref = fileTable.getPreferredSize();
+            int contentW = Math.max(fileTable.getWidth(), pref != null ? pref.width : 0);
+            int contentH = Math.max(fileTable.getHeight(), pref != null ? pref.height : 0);
+            int maxX = Math.max(0, contentW - viewport.getWidth());
+            int maxY = Math.max(0, contentH - viewport.getHeight());
+            target.x = Math.max(0, Math.min(target.x, maxX));
+            target.y = Math.max(0, Math.min(target.y, maxY));
+            viewport.setViewPosition(target);
+        } else {
+            fileTable.scrollRectToVisible(new Rectangle(target.x, target.y, 1, 1));
+        }
+    }
+
+    private void clearArchiveReturnState() {
+        archiveReturnDirectory = null;
+        archiveReturnViewPosition = null;
+    }
+
     /**
      * Public wrapper to select an item by name from outside this class.
      * Useful for other UI components to request focusing a specific file.