Spannable: Add BackgroundSpan
BackgroundSpan: Span to change the back groundSpan of characters.
Example:
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Dali::Toolkit::Text::SpannableString ss =
Dali::Toolkit::Text::SpannableString::New("Testing");
auto greenSpan = Dali::Toolkit::Text::BackgroundColorSpan::New(Color::GREEN);
ss.AttachSpan(
greenSpan,
Dali::Toolkit::Text::Range::New(0u, 3u));
Dali::Toolkit::Text::SetSpannedText(textLabel,ss);
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Change-Id: I3f5414ee5268799ad8e174db4b693c70f4b9b1b3