diff -rupN --no-dereference qt-creator-opensource-src-4.12.4/share/applications/org.qt-project.qtcreator.desktop qt-creator-opensource-src-4.12.4-new/share/applications/org.qt-project.qtcreator.desktop
--- qt-creator-opensource-src-4.12.4/share/applications/org.qt-project.qtcreator.desktop	2020-07-07 10:05:21.000000000 +0200
+++ qt-creator-opensource-src-4.12.4-new/share/applications/org.qt-project.qtcreator.desktop	2020-07-08 20:05:02.905128663 +0200
@@ -8,5 +8,5 @@ Icon=QtProject-qtcreator
 StartupWMClass=qtcreator
 Terminal=false
 Categories=Development;IDE;Qt;
-MimeType= text/x-c++src;text/x-c++hdr;text/x-xsrc;application/x-designer;application/vnd.qt.qmakeprofile;application/vnd.qt.xml.resource;
+MimeType=text/x-c++src;text/x-c++hdr;text/x-xsrc;application/x-designer;application/vnd.qt.qmakeprofile;application/vnd.qt.xml.resource;