kde/{kate,konqueror,okular}: decrease text mimetype preference

These .desktop files set InitialPreference>1 which will override other
associations even the .desktop appears first in XDG_DATA_DIRS. This
applies to:

- org.kde.kate.desktop
- org.kde.kwrite.desktop
- kfmclient_html.desktop
- okularApplication_txt.desktop

Fixes #86137

1 files changed, 9 insertions, 0 deletions

diff --git a/pkgs/applications/kde/okular.nix b/pkgs/applications/kde/okular.nix
index f07df73a25564..3bcdb9ca84244 100644
--- a/pkgs/applications/kde/okular.nix
+++ b/pkgs/applications/kde/okular.nix
@@ -18,6 +18,15 @@ mkDerivation {
     kwindowsystem libkexiv2 libspectre libzip phonon poppler qca-qt5
     qtdeclarative qtsvg threadweaver kcrash
   ] ++ lib.optional (!stdenv.isAarch64) chmlib;
+
+  # InitialPreference values are too high and end up making okular
+  # default for anything considered text/plain. Resetting to 1, which
+  # is the default.
+  postPatch = ''
+    substituteInPlace generators/txt/okularApplication_txt.desktop \
+      --replace InitialPreference=3 InitialPreference=1
+  '';
+
   meta = with lib; {
     homepage = "http://www.kde.org";
     license = with licenses; [ gpl2 lgpl21 fdl12 bsd3 ];