void RichTextBoxMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
{
if (FRichTextBox.Lines.Length == 0)
{
return;
}
var charIndex = FRichTextBox.GetCharIndexFromPosition(e.Location);
int newHoverLine = FRichTextBox.GetLineFromCharIndex(charIndex);
//avoid some flicker
if (newHoverLine != FHoverLine)
// if ((e.Location.X != FLastMouseHoverLocation.X) || (e.Location.Y != FLastMouseHoverLocation.Y))
{
FLastMouseHoverLocation = e.Location;
FHoverLine = newHoverLine;
ShowToolTip(e.X + DIPX(15));
RedrawSelection();
}
}