[umbrello] [Bug 452875] New: Better document available DPI change setting when exporting image

[1234ab]

https://bugs.kde.org/show_bug.cgi?id=452875

            Bug ID: 452875
           Summary: Better document available DPI change setting when
                    exporting image
           Product: umbrello
           Version: 2.33.2 (KDE releases 20.12.2)
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: documentation
          Assignee: umbrello-devel at kde.org
          Reporter: nevenincs007 at gmail.com
  Target Milestone: ---

SUMMARY

Awesome tool! However, when starting to first use it, there were some stuff
that are unintuitive, here's one:
So I exported the image of a class diagram using the method available
[here](https://docs.kde.org/stable5/en/umbrello/umbrello/other-features.html#export-as-png),
and it was pretty pixelated, I also found the same option in the right click
menu.

So I thought about reporting it, but I thought there's no way no one else found
it, and sure enough I found
[this](https://invent.kde.org/sdk/umbrello/-/commit/3065740d686a49e918b34fc15f004ba40d0584c6)
commit, and after that I actually found the "Export diagrams as Pictures"
option in the file menu, where I could set the resolution.

So I'd suggest to make the option better discoverable
I wouldn't think it would be under File section, and I didn't search there at
all until I found out that the option is for sure in the code, so it has to be
somewhere, maybe I could've searched there sooner, but I was just so sure that
I already found the image exporter, and I was looking for options near those,
and not away like in another menu
Though maybe it does belong more to a general menu (like File) then to the
Diagram menu, because it exports all diagrams, instead of just one, so idk.

So in my opinion an improvement would be to move it to a more noticeable place,
or maybe remove the other one from the right click menu / replace it with the
one that can do more, so people don't get confused between the 2 versions (the
one with the DPI change and the one without).

But if that is too dramatic, I think it would still be very good if the
corresponding part of the documentation mentioned (I did read it when I had the
problem, so it would have helped at least me) that there's an option for that.
I can try to create a PR with that,

instead of this:
```
Exporting to an Image

You can also export a complete diagram as an image. The only thing you need to
do is select the diagram you want to export, and then the option Export as
Picture... from the Diagram menu. 
```

something like this:
```
Exporting to an Image

You can also export a complete diagram as an image. The only thing you need to
do is select the diagram you want to export, and then the option Export as
Picture... from the Diagram menu. You can also export multiple diagrams at once
using the Export Diagrams as Pictures... option from the File menu. With this,
you can also set the image resolution, so that the images won't be as blurry.
```

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