Bug 502417

Git commit 9bb5addaedd9ac386dd3d88a7fefdf4e47a20d4b by Stefan Gerlach.
Committed on 12/04/2025 at 10:51.
Pushed by sgerlach into branch 'master'.

Fix LaTeX label font family problem and format temp latex file

M  +24   -16   src/tools/TeXRenderer.cpp

https://invent.kde.org/education/labplot/-/commit/9bb5addaedd9ac386dd3d88a7fefdf4e47a20d4b

Thanks for the patch! 
Sadly, neither selecting "Latin Modern Regular" in an unpatched LabPlot version nor applying the patch fixes the issue on my end. 
Going by the patch, I set:
file.setAutoRemove(false);
(i.e. commented that line out) and ran again. I found:
/dev/shm/labplot_IlpGgK.tex
then, and running pdflatex revewals the attached PDF. I also attached the .TEX file. 

So all seems to work fine, but thngs are just empty in LabPlot. I also attached a screenshot of the workspace.

Created attachment 180205 [details]
Screenshot from labplot (no matter whether patch is applied)

Created attachment 180206 [details]
PDF created by pdflatex

Created attachment 180207 [details]
tex file from /dev/shm created by LabPlot (after application of patch)

Can you check in the "About dialog" if Poppler is available? Without Poppler the created PDF can't be shown in the plot.

Sure. How is poppler availability signaled in the "About" dialog? 
I get the following text there:
```
Debug build 
Apr 12 2025, 19:55:32
System: Gentoo Linux
Locale: German,Germany (Decimal point '.', Group separator ','
Number settings: Decimal point '.', Group separator ',', Exponential 'E', Zero digit '0', Percent '%', Positive/Negative sign '+'/'-' (Updated on restart)
Architecture: x86_64-little_endian-lp64
Kernel: linux 6.12.9-gentoo
C++ Compiler: GNU 14.2.1
C++ Compiler Flags: -march=haswell -mabm -O2 -pipe -frecord-gcc-switches -fno-operator-names -fno-exceptions -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Werror=init-self -Werror=undef -Wvla -Wdate-time -Wsuggest-override -Wlogical-op -pedantic -Wzero-as-null-pointer-constant -Wmissing-include-dirs -fdiagnostics-color=always -Wall -Wextra -Wundef -Wpointer-arith -Wunreachable-code -Wunused -Wdeprecated-declarations -fno-omit-frame-pointer -fstack-protector -fexceptions -std=c++17 -O2 -Wcast-align -Wswitch-enum -fvisibility=default -pedantic -Wzero-as-null-pointer-constant
```
and in "Components":
```
LabPlot: 2.11.1
KDE Frameworks: 6.10.0
Qt: Using 6.8.2 and built against 6.8.2
Gentoo Linux (Xcb)
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.12.9-gentoo
```
Since I was not sure whether this indicates Poppler availability, I grepped the build log for "poppler" and found the following lines from the configure phase:
```
-- Poppler: Qt6 requires Core                                                                                                                                                                                                               -- Found Poppler_Core: /usr/lib64/libpoppler.so (found version "25.03.0")                                                                                                                                                                   -- Found Poppler_Qt6: /usr/lib64/libpoppler-qt6.so (found version "25.03.0")                                                                                                                                                                -- Found Poppler: /usr/lib64/libpoppler.so;/usr/lib64/libpoppler-qt6.so (found suitable version "25.03.0", minimum required is "0.62.0") found components: Qt6                                                                               * Poppler (required version >= 0.62.0), A PDF rendering library, <https://poppler.freedesktop.org/>                                                                                                                                        
```
So it seems it has correctly linked against Poppler.

Can you try the latest development version? There are several fixes which may address this issue.

Indeed, that did the trick! I tried with current master, i.e. version 2.11.0-1492-g7bc8ec4b6, and now it works! 
The result is somehow blurry as soon as greek characters are involved (see attached screenshot), but the bug itself is solved. So I think we can close this issue, or do you want to keep it open until a new release is cut?

Created attachment 180239 [details]
Screenshot from fresh labplot build from master

(In reply to Oliver Freyermuth from comment #9)
> Indeed, that did the trick! I tried with current master, i.e. version
> 2.11.0-1492-g7bc8ec4b6, and now it works! 
> The result is somehow blurry as soon as greek characters are involved (see
> attached screenshot), but the bug itself is solved. So I think we can close
> this issue, or do you want to keep it open until a new release is cut?

The problem with the blurry result for small(er) labels sizes (should look better if you zoom into the worksheet) is already tracked in 466949. We can close this ticket. Thank you for reporting this issue!