How to change the order of tabs in JTabbedPane in Netbeans

Java Editor

1. Click Window » Preferences
2. Expand Java » Code Style
3. Click Formatter
4. Click the Edit button
5. Click the Indentation tab
6. Under General Settings, set Tab policy to: Spaces only
7. Click OK ad nauseam to apply the changes.

[Note: If necessary save profile with a new name as the default profile cannot be overwritten.]

Default Text Editor

Before version 3.6:

Window->Preferences->Editors->Text Editors->Insert spaces for tabs

Version 3.6 and later:

1. Click Window » Preferences
2. Expand General » Editors
3. Click Text Editors
4. Check Insert spaces for tabs
5. Click OK ad nauseam to apply the changes.

Note that the default text editor is used as the basis for many non-Java editors in Eclipse. It's astonishing that this setting wasn't available until 3.3.

C / C++

1. Click Window » Preferences
2. Expand C/C++ » Code Style
3. Click Formatter
4. Click the New button to create a new profile, then OK to continue
5. Click the Indentation tab
6. Under General Settings, set Tab policy to: Spaces only
7. Click OK ad nauseam to apply the changes.

HTML

1. Click Window » Preferences
2. Expand Web » HTML Files
3. Click Editor
4. Under Formatting, select the Indent using spaces radio button
5. Click OK to apply the changes.

CSS

Follow the same instructions for HTML, but select CSS Files instead of HTML Files.

JSP

By default, JSP files follow the formatting preferences for HTML Files.

XML

XML files spacing is configured in Preferences.

1. Click Window » Preferences
2. Expand XML » XML Files
3. Click Editor
4. Select Indent using spaces
5. You can specify the Indentation size if needed: number of spaces to indent.

After looking at the solutions for this question (draggable tabs in Swing), I found that the actual TabbedPaneUI has some methods that can fix both problems: Only drag window in tab area, which turned out to be the hardest part, and not drag when above the tabs themselves. The relevant code follows, in the two sections marked with "// ::". The code is adapted from the question-mentioned Kirill-code. The code doesn't handle other cases than when the tabs are at top - which makes sense when considering what I want to do.

        // mouse listener for dragging the host window
        MouseAdapter adapter = new MouseAdapter() {
            int lastX;
            int lastY;

            boolean _dragInitiated;

            @Override
            public void mousePressed(MouseEvent e) {
                TabbedPaneUI ui = _windowTabs.getUI();

                // :: Won't drag if we're positioned above a tab in tab area
                if (ui.tabForCoordinate(_windowTabs, e.getX(), e.getY()) != -1) {
                    _dragInitiated = false;
                    return;
                }

                // :: Won't drag if we're below the tab area
                int maxY = 0;
                for (int i = 0; i < _windowTabs.getTabCount(); i++) {
                    Rectangle bounds = ui.getTabBounds(_windowTabs, i);
                    int y = bounds.y + bounds.height;
                    if (y > maxY) {
                        maxY = y;
                    }
                }
                _dragInitiated = true;
                if (maxY > 0) {
                    if (e.getY() > maxY) {
                        _dragInitiated = false;
                    }
                }

                Point eventLocationOnScreen = e.getLocationOnScreen();
                if (eventLocationOnScreen == null) {
                    Component source = (Component) e.getSource();
                    eventLocationOnScreen = new Point(e.getX() + source.getLocationOnScreen().x, e.getY()
                            + source.getLocationOnScreen().y);
                }

                lastX = eventLocationOnScreen.x;
                lastY = eventLocationOnScreen.y;
            }

            @Override
            public void mouseDragged(MouseEvent e) {
                if (!_dragInitiated) {
                    return;
                }

                Point eventLocationOnScreen = e.getLocationOnScreen();
                if (eventLocationOnScreen == null) {
                    Component source = (Component) e.getSource();
                    eventLocationOnScreen = new Point(e.getX() + source.getLocationOnScreen().x, e.getY()
                            + source.getLocationOnScreen().y);
                }

                int dx = eventLocationOnScreen.x - lastX;
                int dy = eventLocationOnScreen.y - lastY;
                Window win = POTabbedFrame.this;
                Point loc = win.getLocation();
                win.setLocation(loc.x + dx, loc.y + dy);
                lastX = eventLocationOnScreen.x;
                lastY = eventLocationOnScreen.y;
            }
        };
        _windowTabs.addMouseListener(adapter);
        _windowTabs.addMouseMotionListener(adapter);