In 2008 I entered a bug in OpenOffice.org: https://bz.apache.org/ooo/show_bug.cgi?id=97151 (Space between paragraphs filled with paragraph background color).
Regina Henschel consolidated that bug with some others to a new bug: https://bz.apache.org/ooo/show_bug.cgi?id=125316 (Writer does not accept CSS box model for paragraphs)
I will copy her bug issue text from AOO because it still exists in both programs AOO and LO (Regina, I hope you have no problem with that):
In ODF1.2 the spacing around paragraphs is done with the properties
fo:margin, fo:border and fo:padding. [chapter 20.198, 20.176, 20.210] They have no own definitions, but take the definitions from $7 in XSL http://www.w3.org/TR/2001/REC-xsl-20011015/. And XSL uses directly the definitions from CSS2. And there we find the "Box model" http://www.w3.org/TR/CSS2/box.html. So in turn AOO should render paragraphs as defined in this "Box model".
The margin area is transparent. In chapter 8.2 in CSS2 "Margin backgrounds are always transparent."
Error: Writer extends the paragraph background into the top-margin, see first page of attached document.
The properties margin, border and padding are independent usable.
Error: Writer removes padding, when no border exists, see second page of attached document. The last text there should have a padding.
I [Regina] have found several issues with descriptions from a user point of view. I [Regina] will set them as duplicate to this [AOO issue 125316]. But the problems described there should be considered when working on this issue.
Created attachment 131246 [details]
Example with margins, borders and padding
Attached a test file created with LO 22.214.171.124, based on Regina Henschel's example file for AOO.
This problem still occurs in LibreOffice Version: 126.96.36.199
Build ID: 7074905676c47b82bbcfbea1aeefc84afe1c50e1
CPU Threads: 8; OS Version: Windows 6.2; UI Render: default; Layout Engine: new; Calc: CL
Created attachment 133674 [details]
Example with different and with same paragraph style
The problem is a rendering problem. LibreOffice and all older versions down to OpenOffice.org 1.1.5 render the background of the padding rectangle in to bottom margin, if the following paragraph has the same style.
Because the users, who have created documents with this versions and have used that feature would complain, if the rendering is now different, I think, that we need a different solution. Perhaps we can add an attribute in ODF 1.3, that allows to fill the area between the paragraph with the background of the padding rectangle. Values might be "equal" to cover LibreOffice way of handling it, and "always" to cover Microsoft way, and "CSS" to conform to CSS, which would result in always transparent margin.
I will attach some screenshots, how other applications render the attached file.
Created attachment 133675 [details]
Word 2010 (after "repair" the document) and GoogleDocs show similar rendering (and some errors like missing borders). The background color of the padding area is extended to the next paragraph.
Created attachment 133676 [details]
TextMaker shows a rendering similar to LibreOffice.
Created attachment 133677 [details]
Webodf renders the file correctly with transparent margins.
After asking on the dev mailing list, I get the response, that this LO can solve this by a compatibility flag and no changes in the ODF specification are needed. https://lists.freedesktop.org/archives/libreoffice/2017-May/077789.html
Created attachment 134394 [details]
Wrong handling of negative first line indent
And here another problem of "does not accept CSS box model". The negative first-line indent extends the box, but it should float out of the box.
*** Bug 37653 has been marked as a duplicate of this bug. ***
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The padding color is still painted into the margin area, if two adjacent paragraphs have the same style. To be clear: The option "Merge with next paragraph" is disabled.
Error seen in Version: 188.8.131.52.alpha0+ (x64)
Build ID: 6baca63b44bf7f75a522b1adc4b4bbce502aec3b
CPU threads: 8; OS: Windows 10.0; UI render: GL; VCL: win;
TinderBox: Win-x86_64@42, Branch:master, Time: 2018-10-20_01:35:41
Locale: de-DE (en_US); Calc: CL