Bug 250604 [FieldAssist] API - ContentProposalAdapter needs isShowing() method
Please implement a method ContentProposalAdapter.isShwoing(). The method should return a boolean whether the content assistant proposal popup is open or not.
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/ContentProposalAdapter.java
}
			
			/*
			 * (non-Javadoc)
			 * @see org.eclipse.jface.dialogs.PopupDialog#getForeground()
			 */
			protected Color getForeground() {
				return control.getDisplay().
						getSystemColor(SWT.COLOR_INFO_FOREGROUND);
			}
			
			/*
			 * (non-Javadoc)
			 * @see org.eclipse.jface.dialogs.PopupDialog#getBackground()
			 */
			protected Color getBackground() {
				return control.getDisplay().
						getSystemColor(SWT.COLOR_INFO_BACKGROUND);
			}
			/*
			 * Set the text contents of the popup.
			 */
			void setContents(String newContents) {
				if (newContents == null) {
					newContents = EMPTY;
				}
				this.contents = newContents;
				if (text != null && !text.isDisposed()) {
					text.setText(contents);
				}