Workaround for unexpected text wrapping

This commit adds one additional point to the width when calculating the
minimum size of the textLabel in ExpandableComposite. This serves as a
workaround for a current limitation in the SWT implementation on Windows.
With certain zoom settings (e.g., 125% or 175%), depending on the length
of the label text, the calculated width may be too small, causing the
text to wrap unnecessarily. This is intended as a temporary workaround.

Contributes to #2980

Author: akoch-yatta

bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/ExpandableComposite.java

@@ -287,7 +287,7 @@ protected void layout(Composite parent, boolean changed) {
 			Point labelDefault = this.textLabelCache.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 
 			int tcWidthBeforeSplit = Math.min(width, tcDefault.x);
-			int labelWidthBeforeSplit = Math.min(width, labelDefault.x);
+			int labelWidthBeforeSplit = Math.min(width, labelDefault.x + 1 /* compensate rounding issue in windows */);
 
 			int tcWidthAfterSplit = tcWidthBeforeSplit;
 			int labelWidthAfterSplit = labelWidthBeforeSplit;