On 05/29/2017 05:46 PM, Scott Kostyshak wrote:
> On Mon, May 29, 2017 at 11:15:01PM +0200, Enrico Forestieri wrote:
>
>> However, given the semantics of \vspace, that change should not have an
>> effect. Indeed, when used within a paragraph, the vertical space is added
>> after the line in which the \vspace appears. So, for example, if you have
>> the following snippet:
>>
>> Here is a vspace\vspace{1cm} after this line. How can be seen it only
>> appears after the first line of this paragraph.
>>
>> Supposing that the first line ends at the word "appears", the output would be
>>
>> Here is a vspace after this line. How can be seen it only appears
>> ↕ 1cm
>> after the first line of this paragraph.
>>
>> Thus, given that after that \vspace the line ends, one can think that
>> a following blank line is irrelevant, but apparently it is not so.
>> Moreover, the subsequent \vspace is not followed by a blank line
>> (and this is not due to the above hunk).
> I had always wondered how \vspace in paragraphs worked. Now I understand
> and I also understand how LyX cannot display them exactly like the PDF
> output because LyX does not know where the line break will be.
>
>> Anyway, neither the change is desired, nor I can explain how that hunk
>> slipped in, so I am going to revert it.
> Thanks for the quick fix.
>
> By the way, if anyone is curious how I noticed that difference in
> spacing, it is thanks to the open-source "diffpdf" tool.
>
> I compared the PDF that stable LyX produced for me of my paper with the
> PDF that master LyX produces, with the following command:
>
> diffpdf mwe_before.pdf mwe_after.pdf
>
> Setting compare to "Appearance" leads to the attached screenshot:
>
> I find diffpdf to be a valuable tool when testing.
I can see why!!
Richard
