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[Aere Greenway <1611180@xxxxxxxxxxxxxxxxxx>]

A text-file of the debug-trace (information logged using
System.out.println()) has been attached.

The problem area is toward the very end.  You can see where I scrolled
(and selected an item in the assignable combo-box in the trace entry:

jComboBoxF2Assign.itemStateChanged,
event=java.awt.event.ItemEvent[ITEM_STATE_CHANGED,item=8-Balance,stateChange=DESELECTED]
on
javax.swing.JComboBox[,0,201,299x28,layout=javax.swing.plaf.basic.BasicComboBoxUI$Handler,alignmentX=0.0,alignmentY=0.0,border=javax.swing.plaf.synth.SynthBorder@1970b64,flags=328,maximumSize=java.awt.Dimension[width=32767,height=32],minimumSize=,preferredSize=,isEditable=false,lightWeightPopupEnabled=true,maximumRowCount=8,selectedItemReminder=8-Balance]

The note played before doing that was displayed blue, and the note
played after doing that was displayed yellow.

** Attachment added: "Debug trace of the problem."
   https://bugs.launchpad.net/ubuntu/+source/openjdk-8/+bug/1611180/+attachment/4717677/+files/DebugTrace.txt

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https://bugs.launchpad.net/bugs/1611180

Title:
  JPanel XOR Graphics Is Wrong Color After Scrolling A Combo-Box

Status in openjdk-8 package in Ubuntu:
  New

Bug description:
  Normally, XOR graphics in a JPanel works fine (and is the right
  color).

  But if you open (expand) a combo-box, and scroll it, then select the
  item that was formerly selected, the next time you do XOR graphics in
  an adjacent JPanel, the color is wrong.

  In this particular case, the color being XOR'ed is pure blue
  (0,0,255), but instead of blue, it appears on the screen as yellow.
  The graphics area background is white (255,255,255).

  I expected the color of the XOR'ed note-head ellipse to be blue (as it
  was in openjdk-7), but it was instead yellow, but it only happens
  after scrolling a combo-box in an adjacent panel.

  This problem appeared when Open Java 8 became the default JRE in
  Ubuntu.  It happens in most (probably all) Ubuntu variants.

  aere@Aere-Dell-Inspiron:~$ lsb_release -rd
  Description:	Ubuntu 16.04.1 LTS
  Release:	16.04

  Installed version: 8u91-b14-0ubuntu4~16.04.1

  I will attach the source code of part of the application that does the
  XOR graphics, and in that file, the following method does the XOR
  graphics:

  public void markNote(int keyOffset)

  I will also attach a Debian package which will allow you to install a
  30-day free-trial version of the KeyMusician Keyboard application,
  which will allow you to reproduce the problem.

  To reproduce the problem:

  1. Run the KeyMusician Keyboard application (you can use the default,
  pre-loaded soundfont of the Java Sound (Gervill) synthesizer).

  2. When the music-staff is displayed, type some letter keys (or click
  with the mouse in the musical staff graphics display area.  You should
  see round filled dots appear, whose color is blue.  This is the
  expected behavior.

  3. Click on the combo-box above the "ASSIGNABLE" slider, which opens
  the combo-box.  Then use its scroll-bar to scroll it all the way to
  the bottom, and back to the top.  Then re-select what was already
  selected ("modulation", in the default Linux configuration).

  4. Type some letter-keys (or click in the musical staff graphics
  area).  This time, the filled-circles (the note-heads) will be yellow.
  They will remain yellow, even if you iconify & restore the application
  window, or click on other tabbed panels (for the different function
  keys.

  The method doing the XOR graphics is the following:

      public void markNote(int keyOffset)
      {
          System.out.println("(un)markNote(" + keyOffset + ")" + "external=" + isExternalNote) ;
          if (!isSetup && keyOffset >= 0 && keyOffset < NUM_KEYS)
          {
              dim = getSize() ;
              height = dim.getHeight() ;
              width = dim.getWidth() ;
              commonSetup() ;
              double markHeight = keyWidth  ;
              double markWidth = keyWidth * 1.25 ;
              double y = height - (keyOffset + 1) * keyWidth ;
              double x = shortLineStart + (shortLineLength / 2) - (markWidth / 2) ;
              System.out.println("markNote " + x + "," + y) ;
              System.out.println("BG=" + g2.getBackground() + ", FG=" + g2.getPaint() + ", newBG=" + backGround + ", newFG=" + foreGround) ; // TEMPORARY
              g2.setXORMode(backGround) ;
              g2.setColor(foreGround) ;
              if (isExternalNote)
              {
                  g2.setPaint(KEY_MARK_COLOR_EXTERNAL) ;
              }
              else
              {
  //                g2.setPaint(KEY_MARK_COLOR) ;
                  g2.setPaint(Color.BLUE) ;
              }
              Ellipse2D.Double mark = new Ellipse2D.Double(x, y, markWidth, markHeight) ;
              g2.fill(mark) ;
              System.out.println("Color=" + g2.getPaint()) ; // TEMPORARY
              g2.setPaintMode() ;
          }
      }

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: openjdk-8-jre 8u91-b14-0ubuntu4~16.04.1
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic i686
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: i386
  CurrentDesktop: LXDE
  Date: Mon Aug  8 19:45:42 2016
  InstallationDate: Installed on 2013-05-18 (1178 days ago)
  InstallationMedia: Lubuntu 13.04 "Raring Ringtail" - Release i386 (20130423.1)
  SourcePackage: openjdk-8
  UpgradeStatus: Upgraded to xenial on 2016-07-22 (18 days ago)

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