slight improvements to toggle comment feature

pdex/src/processing/mode/experimental/DebugEditor.java

@@ -1683,6 +1683,79 @@ public class DebugEditor extends JavaEditor implements ActionListener {
 			errorCheckerService.runManualErrorCheck();
 		}
 	}
+	
+  /**
+   * Handles toggle comment. Slightly improved from the default implementation
+   * in {@link processing.app.Editor}
+   */
+  protected void handleCommentUncomment() {
+    // log("Entering handleCommentUncomment()");
+    startCompoundEdit();
+
+    String prefix = getCommentPrefix();
+    int prefixLen = prefix.length();
+
+    int startLine = textarea.getSelectionStartLine();
+    int stopLine = textarea.getSelectionStopLine();
+
+    int lastLineStart = textarea.getLineStartOffset(stopLine);
+    int selectionStop = textarea.getSelectionStop();
+    // If the selection ends at the beginning of the last line,
+    // then don't (un)comment that line.
+    if (selectionStop == lastLineStart) {
+      // Though if there's no selection, don't do that
+      if (textarea.isSelectionActive()) {
+        stopLine--;
+      }
+    }
+
+    // If the text is empty, ignore the user.
+    // Also ensure that all lines are commented (not just the first)
+    // when determining whether to comment or uncomment.
+    boolean commented = true;
+    for (int i = startLine; commented && (i <= stopLine); i++) {
+      String lineText = textarea.getLineText(i).trim();
+      if (lineText.length() == 0)
+        continue; //ignore blank lines
+      commented = lineText.startsWith(prefix);
+    }
+
+    // log("Commented: " + commented);
+
+    // This is the line start offset of the first line, which is added to
+    // all other lines while adding a comment. Required when commenting 
+    // lines which have uneven whitespaces in the beginning. Makes the 
+    // commented lines look more uniform.    
+    int lso = Math.abs(textarea.getLineStartNonWhiteSpaceOffset(startLine)
+        - textarea.getLineStartOffset(startLine));
+
+    for (int line = startLine; line <= stopLine; line++) {
+      int location = textarea.getLineStartNonWhiteSpaceOffset(line);
+      String lineText = textarea.getLineText(line);
+      if (lineText.trim().length() == 0)
+        continue; //ignore blank lines
+      if (commented) {
+        // remove a comment
+        if (lineText.trim().startsWith(prefix + " ")) {
+          textarea.select(location, location + prefixLen + 1);
+        } else {
+          textarea.select(location, location + prefixLen);
+        }
+        textarea.setSelectedText("");
+      } else {
+        // add a comment
+        location = textarea.getLineStartOffset(line) + lso;
+        textarea.select(location, location);
+        textarea.setSelectedText(prefix + " "); //Add a '// '
+      }
+    }
+    // Subtract one from the end, otherwise selects past the current line.
+    // (Which causes subsequent calls to keep expanding the selection)
+    textarea.select(textarea.getLineStartOffset(startLine),
+                    textarea.getLineStopOffset(stopLine) - 1);
+    stopCompoundEdit();
+    sketch.setModified(true);
+  }
 
     // TweakMode code
     /**