Implement "Mark occurrences" by double-click and Error Strip

The Mark All' occurrences feature is restricted to certain identifiers defined on individually for each language.
This makes it so, that in addition to whatever is being specified, it is also possible to double-click on any string
to highlight all occurrences. In addition, this adds an error strip to the right side of the text area, marking the positioning of lines associated with syntax errors and 'Mark all'/'Find all' occurrences.

Related to @acardona's report, #56 (comment)

Author: tferr

src/main/java/org/scijava/ui/swing/script/EditorPane.java

@@ -29,12 +29,15 @@
 
 package org.scijava.ui.swing.script;
 
+import java.awt.Color;
 import java.awt.Component;
 import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.Graphics2D;
 import java.awt.event.ActionEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
 import java.awt.image.BufferedImage;
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
@@ -71,6 +74,8 @@
 import org.fife.ui.rtextarea.RTextArea;
 import org.fife.ui.rtextarea.RTextScrollPane;
 import org.fife.ui.rtextarea.RecordableTextAction;
+import org.fife.ui.rtextarea.SearchContext;
+import org.fife.ui.rtextarea.SearchEngine;
 import org.scijava.Context;
 import org.scijava.log.LogService;
 import org.scijava.platform.PlatformService;
@@ -164,6 +169,42 @@ public void hyperlinkUpdate(final HyperlinkEvent hle) {
 			wordMovement(-1, true));
 		ToolTipManager.sharedInstance().registerComponent(this);
 		getDocument().addDocumentListener(this);
+	
+		addMouseListener(new MouseAdapter() {
+
+			SearchContext context;
+
+			@Override
+			public void mousePressed(final MouseEvent me) {
+
+				// 2022.02 TF: 'Mark All' occurrences is quite awkward. What is
+				// marked is language-specific and the defaults are restricted
+				// to certain identifiers. We'll hack things so that it works
+				// for any selection by double-click. See
+				// https://github.com/bobbylight/RSyntaxTextArea/issues/88
+				if (getMarkOccurrences() && 2 == me.getClickCount()) {
+
+					// Do nothing if getMarkOccurrences() is unset or no selection exists
+					final String str = getSelectedText();
+					if (str == null) return;
+
+					if (context != null && str.equals(context.getSearchFor())) {
+						// Selection is the previously 'marked all' scope. Clear it
+						SearchEngine.markAll(EditorPane.this, new SearchContext());
+						context = null;
+					} else {
+						// Use SearchEngine for 'mark all'
+						final Color stashedColor = getMarkAllHighlightColor();
+						setMarkAllHighlightColor(getMarkOccurrencesColor());
+						context = new SearchContext(str, true);
+						context.setMarkAll(true);
+						context.setWholeWord(true);
+						SearchEngine.markAll(EditorPane.this, context);
+						setMarkAllHighlightColor(stashedColor);
+					}
+				}
+			}
+		});
 	}
 
 	@Override

src/main/java/org/scijava/ui/swing/script/TextEditorTab.java

@@ -29,6 +29,7 @@
 
 package org.scijava.ui.swing.script;
 
+import java.awt.BorderLayout;
 import java.awt.Dimension;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
@@ -56,6 +57,7 @@
 import javax.swing.SwingUtilities;
 import javax.swing.text.JTextComponent;
 
+import org.fife.ui.rsyntaxtextarea.ErrorStrip;
 import org.scijava.ui.swing.script.TextEditor.Executer;
 
 /**
@@ -297,8 +299,19 @@ public void actionPerformed(final ActionEvent e) {
 		});
 
 		screenAndPromptSplit = new JSplitPane(JSplitPane.VERTICAL_SPLIT, bottom, prompt_panel);
-		
-		super.setLeftComponent(editorPane.wrappedInScrollbars());
+	
+		// Enable ErrorSrip à la Eclipse. This will keep track of lines with 'Mark All'
+		// occurrences as well as lines associated with ParserNotice.Level.WARNING and
+		// ParserNotice.Level.ERROR. NB: As is, the end of the strip corresponds to the
+		// last line of text in the text area: E.g., for a text area with just 3 lines,
+		// line 2 will be marked at the strip's half height
+		final ErrorStrip es = new ErrorStrip(editorPane);
+		es.setShowMarkAll(true);
+		es.setShowMarkedOccurrences(true);
+		final JPanel holder = new JPanel(new BorderLayout());
+		holder.add(editorPane.wrappedInScrollbars());
+		holder.add(es, BorderLayout.LINE_END);
+		super.setLeftComponent(holder);
 		super.setRightComponent(screenAndPromptSplit);
 		screenAndPromptSplit.setDividerLocation(1.0);