Created attachment 55290 [details]
Visio file that shows lines with text at different line weights
When entering text in a line's text box, Visio defaults to a plain colour fill using the background colour so that the text is visible on top of the line. When importing such diagrams in Libre Office Draw, the text is not visible. See the attached files for further details.
Created attachment 55291 [details]
PNG output from Visio showing what the diagram should look like
Created attachment 55292 [details]
PNG output from LibreOffice showing what LO imports
I will try to have a look ASAP
Ok, I inverstigated and here the problem is that LibreOffice and Visio have conceptual differences. The textarea background colour is basically in Visio a background colour of a bounding box of the wrapped text. There is nothing similar in LibreOffice. The only thing we will eventually be able to do (but after some rework of LO internals) is to set the text background to the textBlock background colour. Currently text boxes inside draw documents cannot specify background of a text-run. Unlike text boxes in writer documents.
I actually remember that I saw this problem already during LO Conf in Paris and we have some proof-of-concept code which is still without effect due to those limitations.
*** Bug 59976 has been marked as a duplicate of this bug. ***
This is fixed in LO 5.0.3