FindReplaceOverlay: avoid inconsistent borders eclipse-platform#2194

When the replace toggle in the FindReplaceOverlay is not shown because
the target file is read-only or because the editor is too small to show
the toggle button, the right border of the overlay is larger than the
others. The reason is an inconsistent layout, as the container always
expects two columns of elements but when the replace toggle is hidden
only one column is present.

With this change, the number of columns of the container is adapted
according to whether the replace toggle is present or not.

Fixed eclipse-platform#2194

bundles/org.eclipse.ui.workbench.texteditor/src/org/eclipse/ui/internal/findandreplace/overlay/FindReplaceOverlay.java

@@ -33,6 +33,7 @@
 import org.eclipse.swt.graphics.Point;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Display;
@@ -695,9 +696,10 @@ private void enableReplaceToggle(boolean enable) {
 		if (!okayToUse(replaceToggle)) {
 			return;
 		}
-		boolean visible = enable && findReplaceLogic.getTarget().isEditable();
-		((GridData) replaceToggleTools.getLayoutData()).exclude = !visible;
-		replaceToggleTools.setVisible(visible);
+		boolean shouldBeVisible = enable && findReplaceLogic.getTarget().isEditable();
+		((GridLayout) containerControl.getLayout()).numColumns = shouldBeVisible ? 2 : 1;
+		((GridData) replaceToggleTools.getLayoutData()).exclude = !shouldBeVisible;
+		replaceToggleTools.setVisible(shouldBeVisible);
 	}
 
 	private void enableReplaceTools(boolean enable) {