Revert workaround for unexpected text wrapping in ExpandableComposite

A workaround for unexpected text wrapping in ExpandableComposite had
been introduced to deal with imprecise size calculation of controls for
zooms like 125% and 175%. With recent changes to SWT, the size
calculation for controls has been improved such that they always
allocate sufficient space to fit their contents in. That makes the
workaround in ExpandableComposite obsolete.

This change thus removes the obsolete workaround.

Author: HeikoKlare

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

@@ -22,7 +22,6 @@
 
 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.ListenerList;
-import org.eclipse.core.runtime.Platform.OS;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.FocusEvent;
 import org.eclipse.swt.events.FocusListener;
@@ -289,13 +288,7 @@ protected void layout(Composite parent, boolean changed) {
 			Point labelDefault = this.textLabelCache.computeSize(SWT.DEFAULT, SWT.DEFAULT);
 
 			int tcWidthBeforeSplit = Math.min(width, tcDefault.x);
-
-			int additionalLabelWidthPadding = 0;
-			if (OS.isWindows()) {
-				/* compensate rounding issue in windows */
-				additionalLabelWidthPadding = 1;
-			}
-			int labelWidthBeforeSplit = Math.min(width, labelDefault.x + additionalLabelWidthPadding);
+			int labelWidthBeforeSplit = Math.min(width, labelDefault.x);
 
 			int tcWidthAfterSplit = tcWidthBeforeSplit;
 			int labelWidthAfterSplit = labelWidthBeforeSplit;