perf: gate sparkline repaints on panel visibility

.gitignore

@@ -1,2 +1,3 @@
 result
 result-*
+stats-daemon/target/

flake.nix

@@ -92,6 +92,13 @@
           formatting = treefmt-eval.config.build.check self;
           build = self.packages.${pkgs.stdenv.hostPlatform.system}.default;
           nova-stats = self.packages.${pkgs.stdenv.hostPlatform.system}.nova-stats;
+          nova-stats-clippy = (pkgs.callPackage ./nix/stats-daemon.nix { }).overrideAttrs (old: {
+            pname = "nova-stats-clippy";
+            nativeBuildInputs = old.nativeBuildInputs ++ [ pkgs.clippy ];
+            buildPhase = "cargo clippy --all-targets -- -D warnings";
+            installPhase = "touch $out";
+            doCheck = false;
+          });
         }
       );
 

modules/Cpu.qml

@@ -202,8 +202,18 @@ M.BarSection {
                         property var _hist: root._coreHistory[parent.parent.index] || []
                         property color _col: parent.parent._barColor
 
-                        on_HistChanged: requestPaint()
-                        on_ColChanged: requestPaint()
+                        on_HistChanged: if (root._showPanel)
+                            requestPaint()
+                        on_ColChanged: if (root._showPanel)
+                            requestPaint()
+
+                        Connections {
+                            target: root
+                            function on_ShowPanelChanged() {
+                                if (root._showPanel)
+                                    sparkline.requestPaint();
+                            }
+                        }
 
                         onPaint: {
                             const ctx = getContext("2d");

stats-daemon/src/main.rs

@@ -177,7 +177,7 @@ fn main() {
         emit_cpu(&mut out, &prev, &curr, &freqs);
         prev = curr;
 
-        if tick % 2 == 0 {
+        if tick.is_multiple_of(2) {
             emit_mem(&mut out);
         }