Bug 21198 On JavaEditor dont use == in the isActivePart() method but instead use .equals(Object)
The class JavaEditor does an == check inside isActivePart(). This means that if the part is embedded inside another one then the check fails. Rather than this can it use .equals instead and dispatch this to the other part that can specialize accordingly, e.g. instead of the current method protected boolean isActivePart() { IWorkbenchWindow window= getSite().getWorkbenchWindow(); IPartService service= window.getPartService(); return (this == service.getActivePart()); } it could have the last line as return (service.getActivePart().equals(this));
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
ITypedRegion segment= (ITypedRegion) segmentation.get(i);
			
			if (i == 0)
				segments[j++]= 0;
				
			int offset= segment.getOffset() - lineOffset;
			if (offset > segments[j - 1])
				segments[j++]= offset;
				
			if (offset + segment.getLength() >= line.getLength())
				break;
				
			segments[j++]= offset + segment.getLength();
		}
		
		if (j < segments.length) {
			int[] result= new int[j];
			System.arraycopy(segments, 0, result, 0, j);
			segments= result;
		}
		
		return segments;
	}
		
	/**
	 * Returns a segmentation of the given line appropriate for bidi rendering. The default
	 * implementation returns only the string literals of a java code line as segments.
	 * 
	 * @param lineOffset the offset of the line
	 * @param line the content of the line