Created attachment 124494 [details]
Screenshot displaying the issue
The non-printing characters are not shown in a text box when activated.
1. Start LibreOffice and create a new Writer document.
2. Activate display of non-printing characters.
3. Insert a text box and enter some spaces, tabs, line breaks and text into it.
2. The non-printing characters are shown in the main text body.
3. The non-printing characters are shown in the text box.
3. No non-printing characters are shown. (See attached screenshot.)
Linux Mint 17.1 64-bit
LO 184.108.40.206 from ppa:libreoffice/libreoffice-5-0 (Build ID: 1:5.0.5~rc2-0ubuntu1~trusty)
confirm Version: 220.127.116.11.alpha0+
Build ID: 0f27cc992a99568e46ffe807ef9dbb5ba0bc601f
CPU Threads: 4; OS Version: Linux 4.2; UI Render: default;
TinderBox: Linux-rpm_deb-x86_64@70-TDF, Branch:master, Time: 2016-04-12_23:40:16
A "Text Box" is a drawing object and comes from the draw/impress modules, and has only in recent builds been directly available along with drawing shape objects in the Writer standard toolbar (long present on the Drawing toolbar).
As drawing objects there are very minimal formatting attributes to be applied to the text annotation, and there are no paragraph object structures in the text.
Showing non-printing characters is simply an attribute that is not implemented for the text annotation contained in a text box--unclear how involved it would be to implement. But question the need for this enhancement.
In any case a dupe of bug 95066
*** This bug has been marked as a duplicate of bug 95066 ***
*** This bug has been marked as a duplicate of bug 102249 ***