Program: 21778
Project: 21778
Buggy source:
@SuppressWarnings("String_Node_Str") protected void drawHoveringText(List list,int x,int y,FontRenderer fontrenderer){
  if (!list.isEmpty()) {
    GL11.glDisable(GL12.GL_RESCALE_NORMAL);
    RenderHelper.disableStandardItemLighting();
    GL11.glDisable(GL11.GL_LIGHTING);
    GL11.glDisable(GL11.GL_DEPTH_TEST);
    int k=0;
    Iterator iterator=list.iterator();
    while (iterator.hasNext()) {
      String s=(String)iterator.next();
      int l=fontrenderer.getStringWidth(s);
      if (l > k) {
        k=l;
      }
    }
    int i1=x + 12;
    int j1=y - 12;
    int k1=8;
    if (list.size() > 1) {
      k1+=2 + (list.size() - 1) * 10;
    }
    this.zLevel=300.0F;
    int l1=-267386864;
    this.drawGradientRect(i1 - 3,j1 - 4,i1 + k + 3,j1 - 3,l1,l1);
    this.drawGradientRect(i1 - 3,j1 + k1 + 3,i1 + k + 3,j1 + k1 + 4,l1,l1);
    this.drawGradientRect(i1 - 3,j1 - 3,i1 + k + 3,j1 + k1 + 3,l1,l1);
    this.drawGradientRect(i1 - 4,j1 - 3,i1 - 3,j1 + k1 + 3,l1,l1);
    this.drawGradientRect(i1 + k + 3,j1 - 3,i1 + k + 4,j1 + k1 + 3,l1,l1);
    int i2=1347420415;
    int j2=(i2 & 16711422) >> 1 | i2 & -16777216;
    this.drawGradientRect(i1 - 3,j1 - 3 + 1,i1 - 3 + 1,j1 + k1 + 3 - 1,i2,j2);
    this.drawGradientRect(i1 + k + 2,j1 - 3 + 1,i1 + k + 3,j1 + k1 + 3 - 1,i2,j2);
    this.drawGradientRect(i1 - 3,j1 - 3,i1 + k + 3,j1 - 3 + 1,i2,i2);
    this.drawGradientRect(i1 - 3,j1 + k1 + 2,i1 + k + 3,j1 + k1 + 3,j2,j2);
    for (int k2=0; k2 < list.size(); ++k2) {
      String s1=(String)list.get(k2);
      fontrenderer.drawStringWithShadow(s1,i1,j1,-1);
      if (k2 == 0) {
        j1+=2;
      }
      j1+=10;
    }
    this.zLevel=0.0F;
    GL11.glEnable(GL11.GL_LIGHTING);
    GL11.glEnable(GL11.GL_DEPTH_TEST);
    RenderHelper.enableStandardItemLighting();
    GL11.glEnable(GL12.GL_RESCALE_NORMAL);
  }
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") protected void drawHoveringText(List list,int x,int y,FontRenderer fontrenderer){
  if (!list.isEmpty()) {
    GL11.glDisable(GL12.GL_RESCALE_NORMAL);
    GL11.glDisable(GL11.GL_LIGHTING);
    GL11.glDisable(GL11.GL_DEPTH_TEST);
    int k=0;
    Iterator iterator=list.iterator();
    while (iterator.hasNext()) {
      String s=(String)iterator.next();
      int l=fontrenderer.getStringWidth(s);
      if (l > k) {
        k=l;
      }
    }
    int i1=x + 12;
    int j1=y - 12;
    int k1=8;
    if (list.size() > 1) {
      k1+=2 + (list.size() - 1) * 10;
    }
    this.zLevel=300.0F;
    int l1=-267386864;
    this.drawGradientRect(i1 - 3,j1 - 4,i1 + k + 3,j1 - 3,l1,l1);
    this.drawGradientRect(i1 - 3,j1 + k1 + 3,i1 + k + 3,j1 + k1 + 4,l1,l1);
    this.drawGradientRect(i1 - 3,j1 - 3,i1 + k + 3,j1 + k1 + 3,l1,l1);
    this.drawGradientRect(i1 - 4,j1 - 3,i1 - 3,j1 + k1 + 3,l1,l1);
    this.drawGradientRect(i1 + k + 3,j1 - 3,i1 + k + 4,j1 + k1 + 3,l1,l1);
    int i2=1347420415;
    int j2=(i2 & 16711422) >> 1 | i2 & -16777216;
    this.drawGradientRect(i1 - 3,j1 - 3 + 1,i1 - 3 + 1,j1 + k1 + 3 - 1,i2,j2);
    this.drawGradientRect(i1 + k + 2,j1 - 3 + 1,i1 + k + 3,j1 + k1 + 3 - 1,i2,j2);
    this.drawGradientRect(i1 - 3,j1 - 3,i1 + k + 3,j1 - 3 + 1,i2,i2);
    this.drawGradientRect(i1 - 3,j1 + k1 + 2,i1 + k + 3,j1 + k1 + 3,j2,j2);
    for (int k2=0; k2 < list.size(); ++k2) {
      String s1=(String)list.get(k2);
      fontrenderer.drawStringWithShadow(s1,i1,j1,-1);
      if (k2 == 0) {
        j1+=2;
      }
      j1+=10;
    }
    this.zLevel=0.0F;
    GL11.glEnable(GL11.GL_LIGHTING);
    GL11.glEnable(GL11.GL_DEPTH_TEST);
    GL11.glEnable(GL12.GL_RESCALE_NORMAL);
  }
}