Thank you all! Plenty workarounds for now. And I can also just wait for them to upgrade to a new 3.16.x or higher.

Raymond


On 24-09-2021 08:31, Matthias Kuhn wrote:
Hi Raymond,

There has been an issue in Qt, where it was very picky with the <style> tag in the svg [1]

This is solved in newer Qt versions (and newer QGIS for Windows builds) but is still present in the early QGIS 3.16 builds based on older Qt versions.

The quick hack is to replace the <style> tag with <style type="text/css"> in the svg.
Or upgrade to the latest QGIS version.

Cheers
Matthias

https://bugreports.qt.io/browse/QTBUG-58326?focusedCommentId=344465&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-344465 <https://bugreports.qt.io/browse/QTBUG-58326?focusedCommentId=344465&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-344465>

On Fri, Sep 24, 2021 at 4:26 AM Nyall Dawson <nyall.daw...@gmail.com <mailto:nyall.daw...@gmail.com>> wrote:

    On Thu, 23 Sept 2021 at 19:26, Raymond Nijssen
    <r.nijs...@terglobo.nl <mailto:r.nijs...@terglobo.nl>> wrote:
     >
     > Hi devs!
     >
     > The dark blue icons on my plugin toolbar buttons are black for
    some of
     > my customers (on Windows). One of them mentioned that they turned
    black
     > after a QGIS update. On my Linux system they are still blue. I
    guess it
     > has to do with Qt.

    Hi Raymond,

    I've seen this in the past. Seems that Qt on windows is more sensitive
    to SVG structure vs other platforms! In the past I've had luck by
    optimising the svg with https://jakearchibald.github.io/svgomg/
    <https://jakearchibald.github.io/svgomg/>  ,
    which seems to make Qt happier... (Turn off "Round/rewrite numbers"
    option though, cos that makes Qt LESS happy!)

    Nyall


     >
     >
     >
     > Here's the content of the svg file:
     >
     > <svg xmlns="http://www.w3.org/2000/svg
    <http://www.w3.org/2000/svg>" viewBox="0 0 32 32">
     >    <defs>
     >      <style>
     >        .a {
     >          fill: #1b3d6e;
     >        }
     >      </style>
     >    </defs>
     >    <path class="a"
     >
    
d="M15.52,6.54a7.29,7.29,0,0,0-1.77,7.38l-9.9,9.9-.34,4.33,5.94-.6v-2.8h2.8V22h2.8l3.37-3.36a7.26,7.26,0,1,0-2.9-12Zm5.37,2.1a2,2,0,1,1,0,2.81A2,2,0,0,1,20.89,8.64Z"/>
     > </svg>
     >
     >
     >
     > And here's how I make the buttons:
     >
     > icon_fn = os.path.join(self.plugin_dir, 'img',
    'icon_configuration.svg')
     > icon = QIcon(icon_fn)
     > action = QAction(icon, 'Configure', self.iface.mainWindow())
     > self.toolbar.addAction(action)
     >
     >
     >
     >
     > Hope anyone can clarify. The svg files were made by a designer, I
    guess
     > in some Adobe application. Hope I don't need adjusting them.
     >
     > Kind regards,
     > Raymond
     >
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