Add a command palette action to reset egui's memory (debug build only)

crates/viewer/re_ui/src/command.rs

@@ -78,6 +78,9 @@ pub enum UICommand {
     #[cfg(not(target_arch = "wasm32"))]
     PrintPrimaryCache,
 
+    #[cfg(debug_assertions)]
+    ResetEguiMemory,
+
     #[cfg(target_arch = "wasm32")]
     CopyDirectLink,
 
@@ -232,6 +235,11 @@ impl UICommand {
                 "Prints the state of the entire primary cache to the console and clipboard. WARNING: this may be A LOT of text.",
             ),
 
+            #[cfg(debug_assertions)]
+            Self::ResetEguiMemory => (
+                "Reset egui memory",
+                "Reset egui memory, useful for debugging UI code.",
+            ),
 
             #[cfg(target_arch = "wasm32")]
             Self::CopyDirectLink => (
@@ -340,6 +348,9 @@ impl UICommand {
             #[cfg(not(target_arch = "wasm32"))]
             Self::PrintPrimaryCache => None,
 
+            #[cfg(debug_assertions)]
+            Self::ResetEguiMemory => None,
+
             #[cfg(target_arch = "wasm32")]
             Self::CopyDirectLink => None,
 

crates/viewer/re_viewer/src/app.rs

@@ -766,6 +766,14 @@ impl App {
                 }
             }
 
+            #[cfg(debug_assertions)]
+            UICommand::ResetEguiMemory => {
+                egui_ctx.memory_mut(|mem| *mem = Default::default());
+
+                // re-apply style, which is lost when resetting memory
+                re_ui::apply_style_and_install_loaders(egui_ctx);
+            }
+
             #[cfg(target_arch = "wasm32")]
             UICommand::CopyDirectLink => {
                 self.run_copy_direct_link_command(store_context);