TYPO3 Core

I'm sorry: the title of this task is not correct, should be something like this "image position below: No margin-bottom if more than one image". Can't change this...

can reproduce this, the CSS set this explicit to margin-bottom: 0;

I performed a little test; here are my findings:

1) TYPO3 6.2.15¶

when you have one image only , the image has a margin-bottom, set with the css rule:

div.csc-textpic .csc-textpic-imagewrap .csc-textpic-image{margin-bottom:10px}

No matter if you select "image below" or "image above" (where it would be more useful IMO).

When you have for example 2 images on 2 columns, the row where the images are has the class csc-textpic-imagerow-last that sets the margin to 0:

 div.csc-textpic div.csc-textpic-imagerow-last, div.csc-textpic div.csc-textpic-imagerow-none div.csc-textpic-last{margin-bottom:0}

2) 7.6.1-dev (latest master); fluid content elements¶

when you select the "images above", no matter how many images are there or the number of columns: the block where the images are have a margin-bottom, set with:

.ce-above .ce-gallery{margin-bottom:10px}

when you select "images below" there is a similar behavior, but the margin is on the top:

.ce-below .ce-gallery{margin-top:10px}

So I think that this issue can be considered solved for version 7 and fluid content elements, that have a more correct behavior

I've repeated a test on both 7.6.16 and 8.7.1 (latest master); the issue is still present on both with CSS_STYLED_CONTENT.

The proposed patch on #65843 is to modify the Typoscript with the following line:

tt_content.image.20.rendering.singleNoCaption.lastRowStdWrap.wrap = <div class="csc-textpic-imagerow csc-textpic-imagerow-last"> | </div>

Results: the patch works, as the margin-bottom will be removed; but it will also be removed in the "image, above" cases.
As I wrote, if you have 2 or more images, you always have no margin-bottom so at least the behavior with the patch will be more consistent.