kdeWrapper: avoid excessive file collisions

pkgs/development/libraries/kde-frameworks/kde-env.nix

@@ -5,7 +5,7 @@ drv: pkgs:
 stdenv.mkDerivation {
   name = "kde-env-${drv.name}";
   nativeBuildInputs = [ lndir ];
-  propagatedUserEnvPkgs = builtins.map lib.getBin ([drv] ++ pkgs);
+  envPkgs = builtins.map lib.getBin ([drv] ++ pkgs);
   unpackPhase = "true";
   configurePhase = "runHook preConfigure; runHook postConfigure";
   buildPhase = "true";
@@ -13,7 +13,7 @@ stdenv.mkDerivation {
     runHook preInstall
 
     propagated=""
-    for i in $propagatedUserEnvPkgs; do
+    for i in $envPkgs; do
         findInputs $i propagated propagated-user-env-packages
     done
 
@@ -26,6 +26,15 @@ stdenv.mkDerivation {
         done
     done
 
+    for p in $propagated; do
+        for s in applications dbus-1 desktop-directories icons mime polkit-1; do
+            if [ -d "$p/share/$s" ]; then
+                propagatedUserEnvPkgs+=" $p"
+                break
+            fi
+        done
+    done
+
     runHook postInstall
   '';
 }

pkgs/development/libraries/kde-frameworks/kde-wrapper.nix

@@ -37,11 +37,7 @@ stdenv.mkDerivation {
         fi
     done
 
-    for s in applications dbus-1 desktop-directories icons mime polkit-1; do
+    mkdir -p "$out/nix-support"
-        if [ -d "$env/share/$s" ]; then
+    ln -s "$env/nix-support/propagated-user-env-packages" "$out/nix-support/"
-            mkdir -p "$out/share"
-            ln -s "$env/share/$s" "$out/share/$s"
-        fi
-    done
   '';
 }