Add basic code mining tracing option to trace rendering

See eclipse-platform#2786

Author: iloveeclipse

bundles/org.eclipse.jface.text/.options

@@ -17,3 +17,5 @@ org.eclipse.jface.text/debug/AbstractInformationControlManager= false
 
 # Enables assertion check for valid offset and length when creating a TextSelection
 org.eclipse.jface.text/assert/TextSelection/validConstructorArguments= false
+
+org.eclipse.jface.text/debug/CodeMining/render= false

bundles/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/codemining/CodeMiningManager.java

@@ -77,6 +77,12 @@ public class CodeMiningManager implements Runnable {
 	 */
 	private IProgressMonitor fMonitor;
 
+	/**
+	 * Debug option for rendering code minings.
+	 */
+	public static final boolean DEBUG_RENDER= "true".equalsIgnoreCase(Platform.getDebugOption("org.eclipse.jface.text/debug/CodeMining/render")); //$NON-NLS-1$ //$NON-NLS-2$
+
+
 	/**
 	 * Constructor of codemining manager with the given arguments.
 	 *
@@ -245,6 +251,11 @@ private void renderCodeMinings(Map<Position, List<ICodeMining>> groups, ISourceV
 			// done.
 			return;
 		}
+
+		if (DEBUG_RENDER) {
+			System.out.println("CodeMiningManager.renderCodeMinings() start"); //$NON-NLS-1$
+		}
+
 		Set<ICodeMiningAnnotation> annotationsToRedraw= new HashSet<>();
 		Set<AbstractInlinedAnnotation> currentAnnotations= new HashSet<>();
 		// Loop for grouped code minings
@@ -287,6 +298,10 @@ private void renderCodeMinings(Map<Position, List<ICodeMining>> groups, ISourceV
 		fInlinedAnnotationSupport.updateAnnotations(currentAnnotations);
 		// redraw the existing codemining annotations since their content can change
 		annotationsToRedraw.stream().forEach(ICodeMiningAnnotation::redraw);
+
+		if (DEBUG_RENDER) {
+			System.out.println("renderCodeMinings end of " + annotationsToRedraw.size() + " mining annotations"); //$NON-NLS-1$ //$NON-NLS-2$
+		}
 	}
 
 	/**

bundles/org.eclipse.jface.text/src/org/eclipse/jface/text/source/inlined/AbstractInlinedAnnotation.java

@@ -21,6 +21,8 @@
 import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.GC;
 
+import org.eclipse.jface.internal.text.codemining.CodeMiningManager;
+
 import org.eclipse.jface.text.IRegion;
 import org.eclipse.jface.text.ITextViewer;
 import org.eclipse.jface.text.ITextViewerExtension5;
@@ -159,6 +161,9 @@ public void redraw() {
 					// adjust offset according folded content
 					offset= ((ITextViewerExtension5) viewer).modelOffset2WidgetOffset(offset);
 				}
+				if (CodeMiningManager.DEBUG_RENDER) {
+					System.out.println("AbstractInlinedAnnotation.redraw()"); //$NON-NLS-1$
+				}
 				InlinedAnnotationDrawingStrategy.draw(this, null, text, offset, pos.getLength(), null);
 			} catch (RuntimeException e) {
 				// Ignore UI error