quickshell: fix unneccessary reloads

When running quickshell, the application reloads itself whenever files change on disk that quickshell loaded. When using e.g. github:noctalia-dev/noctalia-shell which is run by quickshell, the application reloads when `nix flake update` or `sudo nixos-rebuild switch` is used. This behavior can be prevented if nix store paths are ignored whenever files are changed on disk.

pkgs/by-name/qu/quickshell/0001-fix-unneccessary-reloads.patch

@@ -0,0 +1,23 @@
+diff --git a/src/core/generation.cpp b/src/core/generation.cpp
+index c68af71..4967562 100644
+--- a/src/core/generation.cpp
++++ b/src/core/generation.cpp
+@@ -172,12 +172,18 @@ void EngineGeneration::setWatchingFiles(bool watching) {
+ 		if (this->watcher == nullptr) {
+ 			this->watcher = new QFileSystemWatcher();
+ 
++			// note: not using canonicalFilePath() here on purpose,
++			//       since the path could be a link to the nix store
++			//       and the link might change
++
+ 			for (auto& file: this->scanner.scannedFiles) {
++				if (file.startsWith("/nix/store/")) continue;
+ 				this->watcher->addPath(file);
+ 				this->watcher->addPath(QFileInfo(file).dir().absolutePath());
+ 			}
+ 
+ 			for (auto& file: this->extraWatchedFiles) {
++				if (file.startsWith("/nix/store/")) continue;
+ 				this->watcher->addPath(file);
+ 				this->watcher->addPath(QFileInfo(file).dir().absolutePath());
+ 			}

pkgs/by-name/qu/quickshell/package.nix

@@ -32,6 +32,9 @@ stdenv.mkDerivation (finalAttrs: {
     tag = "v${finalAttrs.version}";
     hash = "sha256-e++Ogy91Sv7gGLMdAqZaBzbH/UmPWZ4GAt7VDCA66aU=";
   };
+  patches = [
+    ./0001-fix-unneccessary-reloads.patch
+  ];
 
   nativeBuildInputs = [
     cmake