https://bugs.freedesktop.org/show_bug.cgi?id=52257

--- Comment #5 from Owen Genat <[email protected]> ---
Created attachment 80262
  --> https://bugs.freedesktop.org/attachment.cgi?id=80262&action=edit
Example cell border widths (ODS/PDF/PNG) showing on screen display and export
to PDF.

I am re-closing this bug for a number of reasons:

1. The initial bug as described appears to relate to a change with v3.5.5.3
that altered how cell borders were displayed. Markus has indicated in comment
#2 how this was actually a rectification of a previous problem. That problem is
clearly outlined in bug #51178 which was closed as NOTABUG.

2. No indication of file format (ODS/XLS/XLSX) is provided in either the
description or comments. There are other bugs relating to XLS/XLSX issues with
cell borders such as bug #52578, bug #53287, and bug #56960. Comments in all
those bugs, particularly the last two, are informative of the nature of the
various problems.

3. No example files are provided. I have provided a basic example (with
slightly different values) in
https://bugs.freedesktop.org/show_bug.cgi?id=52578#c5 I am also attaching a
further sample here in keeping with the graphic provided in comment #3. I do
this in the spirit of goodwill as there are a couple of issues here, however
...

4. It appears to me that comment #3 has effectively re-purposed this bug.
Rather than doing so in the generic manner indicated I would suggest raising a
new bug (if none already exists) to address the more specific nature of what
appears to be these concerns. I will detail what I see these concerns as below.

5. The reference to InDesign, while illustrative, carries little weight. Calc
is spreadsheet software, while InDesign is desktop publishing software with no
equivalent in LO. Interoperability with OOXML is a far more powerful argument
and it only supports four different cell border widths (as I indicate in the
comment I refer to above). It is quite likely that LO will head in this
direction in order to simplify both the required code and interoperability.
That is how I am interpreting the comments by developers in the linked /
related bugs.

The issues raised in comment #3 are effectively two: a) cell border of 0.05pt
(a.k.a. "hair" in OOXML) does not export to PDF correctly; b) the on screen
display of cell borders does not accurately resolve widths in the ranges
0.05-0.39pt and 0.40-1.00pt.

(a) looks to me like a bug. This hairline weight is not be treated correctly
during export to PDF. There may be a fix for this in v4.1.0.0. I have not
looked at that.

(b) Markus sums this up neatly in
https://bugs.freedesktop.org/show_bug.cgi?id=53287#c6 Until the UX team come
back with an answer there is little the developers can do. He also made a patch
back in September 2012 to adjust the XLS import values from 24 to 16 ("thick"),
18 to 12 ("medium"), and 6 to 4 ("thin") which may have a bearing here if XLS
is being used.

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