Why composite is expanded by text field? - eclipse

Question

I created a text field which used GridLayout and I set the 3rd parameter of the GridData (grabExcessHorizontalSpace) to true. The Text field is not getting wrap into multiple line when I set a very long sequence of non-whitespace characters won't be split into lines. The Composite is expanded by text filed.
Below is my code:
Composite composite = new Composite(m_shell, SWT.NONE);
composite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, true));
composite.setLayout(new GridLayout(2, false));
Label label = new Label(composite, SWT.LEAD);
label.setText("Label");
label.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false));
Text text = new Text(composite,SWT.MULTI|SWT.BORDER|SWT.WRAP|SWT.V_SCROLL);
GridData gd = new GridData(SWT.FILL, SWT.CENTER, true, false);
gd.heightHint = 2 * text.getLineHeight();
text.setLayoutData(gd);
text.setText("trweghjfbfdshjfghjreuyhjfghkjhjhjsdghjreewhjdfghjhjgfdhjsdghjtreuytrehjdfghjhjdfgh8irtrhjghjhjdfghjdfghjfghjdfg");

Answer 1

I assume you are calling pack on the Shell to complete the layout. This causes controls to be sized at their preferred size - the preferred size for a Text control is the size with no wrapping.
If you want the shell to be a specific size you can layout on the shell without calling pack. The text should then wrap.
Alternatively specify a widthHint for the Text control.

Answer 2

Setting widthHint to 0 together with the horizontalAlignment to SWT.FILL makes the text fill all availible space in its column, but not grow more that that. Instead it wraps as desired:
I tried this on Windows 10 with SWT 3.103.2. Greg seems to have got another result on Mac.
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout());
Composite composite = new Composite(shell, SWT.NONE);
composite.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, true));
composite.setLayout(new GridLayout(2, false));
Label label = new Label(composite, SWT.LEAD);
label.setText("Label");
label.setLayoutData(new GridData(SWT.RIGHT, SWT.CENTER, false, false));
Text text = new Text(composite, SWT.MULTI | SWT.BORDER | SWT.WRAP | SWT.V_SCROLL);
GridData gd = new GridData(SWT.FILL, SWT.CENTER, true, false);
gd.heightHint = 2 * text.getLineHeight();
// Added widthHint
gd.widthHint = 0;
text.setLayoutData(gd);
text.setText("trweghjfbfdshjfghjreuyhjfghkjhjhjsdghjreewhjdfghjhjgfdhjsdghjtreuytrehjdfghjhjdfgh8irtrhjghjhjdfghjdfghjfghjdfg");
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();