procinfo: add windows console field. mux: ignore non-console procs

When considering the fg process, we don't want a newly spawned
notepad.exe to show as the fg process in a cmd/pwsh pane, as it
runs async from the console and isn't attached to it.

We can extract the console handle from the process information and
use a 0 value handle to indicate win32 apps that are not attached
to any console.

We cannot compare console handle values directly: without probing
deeper into the handle we don't know that two differently valued
handles refer to different consoles, because a handle can be
duplicated into another with a different numeric value.

mux/src/localpane.rs

@@ -780,7 +780,9 @@ impl LocalPane {
                     }
 
                     for child in proc.children.values() {
-                        find_youngest(child, youngest);
+                        if child.console != 0 {
+                            find_youngest(child, youngest);
+                        }
                     }
                 }
 

procinfo/src/lib.rs

@@ -31,8 +31,10 @@ pub struct LocalProcessInfo {
     pub argv: Vec<String>,
     pub cwd: PathBuf,
     pub status: LocalProcessStatus,
-    pub children: HashMap<u32, LocalProcessInfo>,
     pub start_time: u64,
+    #[cfg(windows)]
+    pub console: u64,
+    pub children: HashMap<u32, LocalProcessInfo>,
 }
 luahelper::impl_lua_conversion!(LocalProcessInfo);
 

procinfo/src/windows.rs

@@ -86,6 +86,7 @@ fn wstr_to_string(slice: &[u16]) -> String {
 struct ProcParams {
     argv: Vec<String>,
     cwd: PathBuf,
+    console: HANDLE,
 }
 
 struct ProcHandle(HANDLE);
@@ -220,6 +221,7 @@ impl ProcHandle {
         Some(ProcParams {
             argv: cmd_line_to_argv(&cmdline),
             cwd: wstr_to_path(&cwd),
+            console: params.ConsoleHandle,
         })
     }
 
@@ -243,6 +245,7 @@ impl ProcHandle {
         Some(ProcParams {
             argv: cmd_line_to_argv(&cmdline),
             cwd: wstr_to_path(&cwd),
+            console: params.ConsoleHandle as _,
         })
     }
 
@@ -353,6 +356,7 @@ impl LocalProcessInfo {
             let mut start_time = 0;
             let mut cwd = PathBuf::new();
             let mut argv = vec![];
+            let mut console = 0;
 
             if let Some(proc) = ProcHandle::new(info.th32ProcessID) {
                 if let Some(exe) = proc.executable() {
@@ -361,6 +365,7 @@ impl LocalProcessInfo {
                 if let Some(params) = proc.get_params() {
                     cwd = params.cwd;
                     argv = params.argv;
+                    console = params.console as _;
                 }
                 if let Some(start) = proc.start_time() {
                     start_time = start;
@@ -377,6 +382,7 @@ impl LocalProcessInfo {
                 start_time,
                 status: LocalProcessStatus::Run,
                 children,
+                console,
             }
         }