Revert "fix: UART window stability on Windows — lift/focus, remove stray grab_release"

This reverts commit 4ef1ce0c6b.

src/gui/main_window.py

@@ -218,21 +218,16 @@ class MainWindow(ctk.CTk):
         object's perspective); the FileSelector stores both the
         absolute path (for internal use) and the relative path
         (for saving to YAML).
-
-        All attribute accesses are defensive — widgets may not exist
-        yet during construction (e.g. _port_var created in _build_serial).
         """
         if not self._config:
             return
-        # Sync IP address (may not exist yet during _build_config_panel)
+        # Sync IP address
         if self._ip_string_var:
             self._config.zynq_ip = self._ip_string_var.get()
         # Sync Xilinx Kit path
-        if hasattr(self, '_xilinx_path_var'):
-            self._config.xilinx_path = self._xilinx_path_var.get()
-        # Sync serial port (may not exist yet during _build_config_panel)
-        if hasattr(self, '_port_var'):
-            self._config.serial_port = self._port_var.get()
+        self._config.xilinx_path = self._xilinx_path_var.get()
+        # Sync serial port
+        self._config.serial_port = self._port_var.get()
         # Sync file paths from FileSelectors
         files = self._get_selected_files()
         for attr, selector in [
@@ -250,26 +245,7 @@ class MainWindow(ctk.CTk):
                 if abs_path:
                     self._config._config_path  # ensure _config_path is set
                     setattr(self._config, attr, self._config._relative_path(abs_path))
-        # Sync erase checkbox (may not exist yet)
-        if hasattr(self, '_erase_cb_var'):
-            self._config.erase_all = self._erase_cb_var.get()
-
-    def _auto_save_config(self) -> None:
-        """Auto-save config to disk after UI changes.
-
-        Ensures that changes made in the UI (file paths, IP, etc.)
-        are persisted immediately so that _reload_config() picks them
-        up on the next step execution.
-        """
-        if not self._config:
-            return
-        self._sync_config_from_ui()
-        user_config_path = self._get_user_config_path()
-        self._config._config_path = user_config_path
-        try:
-            self._config.save()
-        except Exception:
-            pass  # Silently fail — user can manually save
+        self._config.erase_all = self._erase_cb_var.get()
 
     def _save_config(self) -> None:
         """Save current configuration to user config file (config.yaml).
@@ -317,15 +293,6 @@ class MainWindow(ctk.CTk):
         if self._config:
             self._config.zynq_ip = self._ip_string_var.get()
 
-    def _on_file_selected(self, path: str) -> None:
-        """Handle file selection — sync and auto-save to disk.
-
-        When the user selects a file via the browse dialog, immediately
-        sync the path to the Config object and persist it to YAML so
-        that subsequent step executions pick up the new value.
-        """
-        self._auto_save_config()
-
     # ── UI Construction ────────────────────────────────────────
 
     def _build_ui(self) -> None:
@@ -591,9 +558,7 @@ class MainWindow(ctk.CTk):
             panel,
             label_text="FSBL ELF (.elf):",
             file_types=[("ELF files", "*.elf"), ("All files", "*")],
-            callback=self._on_file_selected,
         )
-        self._fsbl_selector._suppress_callback = True
         if self._config.fsbl_elf_path:
             resolved = self._config.resolve_path(self._config.fsbl_elf_path)
             self._fsbl_selector.set_relative_path(self._config.fsbl_elf_path)
@@ -605,9 +570,7 @@ class MainWindow(ctk.CTk):
             panel,
             label_text="Bootloader BIT (.bit):",
             file_types=[("BIT files", "*.bit"), ("All files", "*")],
-            callback=self._on_file_selected,
         )
-        self._bit_selector._suppress_callback = True
         if self._config.bootloader_bit_path:
             resolved = self._config.resolve_path(self._config.bootloader_bit_path)
             self._bit_selector.set_relative_path(self._config.bootloader_bit_path)
@@ -619,9 +582,7 @@ class MainWindow(ctk.CTk):
             panel,
             label_text="Bootloader ELF (.elf):",
             file_types=[("ELF files", "*.elf"), ("All files", "*")],
-            callback=self._on_file_selected,
         )
-        self._elf_selector._suppress_callback = True
         if self._config.bootloader_elf_path:
             resolved = self._config.resolve_path(self._config.bootloader_elf_path)
             self._elf_selector.set_relative_path(self._config.bootloader_elf_path)
@@ -633,9 +594,7 @@ class MainWindow(ctk.CTk):
             panel,
             label_text="Bootloader BIN (.bin):",
             file_types=[("BIN files", "*.bin"), ("All files", "*")],
-            callback=self._on_file_selected,
         )
-        self._bootloader_bin_selector._suppress_callback = True
         if self._config.bootloader_bin_path:
             resolved = self._config.resolve_path(self._config.bootloader_bin_path)
             self._bootloader_bin_selector.set_relative_path(self._config.bootloader_bin_path)
@@ -669,23 +628,13 @@ class MainWindow(ctk.CTk):
             panel,
             label_text="Firmware BIN (.bin):",
             file_types=[("BIN files", "*.bin"), ("All files", "*")],
-            callback=self._on_file_selected,
         )
-        self._firmware_bin_selector._suppress_callback = True
         if self._config.firmware_bin_path:
             resolved = self._config.resolve_path(self._config.firmware_bin_path)
             self._firmware_bin_selector.set_relative_path(self._config.firmware_bin_path)
             self._firmware_bin_selector.set_path(str(resolved))
         self._firmware_bin_selector.grid(row=8, column=0, sticky="nsew", padx=PADDING, pady=PADDING_SMALL)
 
-        # Enable callbacks now that all selectors are created
-        for sel in (self._fsbl_selector, self._bit_selector, self._elf_selector,
-                     self._bootloader_bin_selector, self._firmware_bin_selector):
-            sel._suppress_callback = False
-
-        # Now sync and save config (all selectors exist)
-        self._auto_save_config()
-
         # Save button
         save_btn = ctk.CTkButton(
             panel,

src/gui/widgets.py

@@ -6,7 +6,6 @@ consistent styling from gui/styles.py.
 
 from __future__ import annotations
 
-import os
 import threading
 
 import customtkinter as ctk
@@ -439,9 +438,7 @@ class ProgressIndicator(ctk.CTkFrame):
 class StatusDisplay(ctk.CTkFrame):
     """Status display widget for operation results.
 
-    Shows status messages in a multi-line, expandable text area that
-    uses the full available space.  Messages are color-coded and
-    automatically wrapped.
+    Shows a status message with color-coded feedback.
     """
 
     def __init__(self, master, **kwargs):
@@ -455,19 +452,15 @@ class StatusDisplay(ctk.CTkFrame):
         self._create_widgets()
 
     def _create_widgets(self) -> None:
-        """Create the status display UI — multi-line expandable area."""
-        self.grid_rowconfigure(0, weight=1)
-        self.grid_columnconfigure(0, weight=1)
-
-        self._status_text = ctk.CTkTextbox(
+        """Create the status display UI."""
+        self._status_label = ctk.CTkLabel(
             self,
+            text="Ready",
             font=FONT_BODY,
-            corner_radius=CORNER_RADIUS,
-            state="disabled",
-            wrap="word",
+            anchor="w",
         )
-        self._status_text.grid(
-            row=0, column=0, sticky="nsew", padx=PADDING, pady=PADDING_SMALL
+        self._status_label.pack(
+            fill="x", padx=PADDING, pady=PADDING_SMALL
         )
 
     def set_status(self, message: str, status: str = "info") -> None:
@@ -477,32 +470,20 @@ class StatusDisplay(ctk.CTkFrame):
             message: Status message text.
             status: Status type for coloring ('info', 'success', 'error', 'warning').
         """
-        self._status_text.configure(state="normal")
-        self._status_text.delete("1.0", "end")
-
+        self._status_label.configure(text=message)
         colors = {
             "info": INFO_COLOR,
             "success": SUCCESS_COLOR,
             "error": DANGER_COLOR,
             "warning": WARNING_COLOR,
         }
-        color = colors.get(status, INFO_COLOR)
-
-        self._status_text.insert("1.0", message)
-        # Tag the entire text with the color (CTkTextbox uses tag_config)
-        self._status_text.tag_config("status", foreground=color)
-        self._status_text.tag_add("status", "1.0", "end")
-
-        self._status_text.configure(state="disabled")
+        self._status_label.configure(text_color=colors.get(status, INFO_COLOR))
 
 
 class FileSelector(ctk.CTkFrame):
     """File selector widget with browse button and path display.
 
-    Stores the full absolute path internally but displays only the
-    filename in the entry field.  Supports relative paths: the
-    ``set_relative_path()`` / ``get_relative_path()`` methods work
-    with paths relative to a given base directory.
+    Allows users to browse for files and displays the selected path.
     """
 
     def __init__(
@@ -525,10 +506,7 @@ class FileSelector(ctk.CTkFrame):
 
         self._callback = callback
         self._file_types = file_types or [("All files", "*")]
-        self._full_path: str = ""           # absolute path (internal)
-        self._relative_path: str = ""       # relative path (synced to Config)
-        self._display_text = ctk.StringVar(value="")
-        self._suppress_callback: bool = False  # True during construction
+        self._selected_path = ctk.StringVar(value="")
 
         self._create_widgets(label_text)
 
@@ -546,10 +524,10 @@ class FileSelector(ctk.CTkFrame):
         )
         label.grid(row=0, column=0, sticky="w", padx=(PADDING, PADDING_SMALL))
 
-        # Path entry — shows only the filename
+        # Path entry
         self._entry = ctk.CTkEntry(
             self,
-            textvariable=self._display_text,
+            textvariable=self._selected_path,
             font=FONT_MONO,
             state="readonly",
         )
@@ -571,60 +549,33 @@ class FileSelector(ctk.CTkFrame):
 
     def _browse(self) -> None:
         """Open file dialog and set selected path."""
+        import customtkinter
         from tkinter import filedialog
 
         file_path = filedialog.askopenfilename(
-            title="Select file",
+            title=f"Select {self._selected_path.get() or 'file'}",
             filetypes=self._file_types,
         )
         if file_path:
             self.set_path(file_path)
 
     def set_path(self, path: str) -> None:
-        """Set the selected file path (absolute or relative).
-
-        Internally stores the absolute path and displays only the
-        filename.
+        """Set the selected file path.
 
         Args:
-            path: Absolute or relative path to the selected file.
+            path: Absolute path to the selected file.
         """
-        self._full_path = path
-        self._display_text.set(os.path.basename(path) if path else "")
-        if self._callback and not self._suppress_callback:
-            self._callback(path)
-
-    def set_relative_path(self, path: str) -> None:
-        """Set a relative path (from config).
-
-        Resolves to absolute for internal storage, shows only filename.
-
-        Args:
-            path: Relative path string.
-        """
-        self._relative_path = path
-        # Resolve to absolute for internal use
-        if path:
-            self._full_path = path  # caller should resolve before calling
-        self._display_text.set(os.path.basename(path) if path else "")
-        if self._callback and not self._suppress_callback:
+        self._selected_path.set(path)
+        if self._callback:
             self._callback(path)
 
     def get_path(self) -> str:
-        """Get the currently selected file path (absolute).
+        """Get the currently selected file path.
 
         Returns:
             Selected file path string.
         """
-        return self._full_path
-
-    def get_relative_path(self) -> str:
-        """Get the currently selected relative path.
-
-        Returns:
-            Relative path string, or empty string.
-        """
-        return self._relative_path
+        return self._selected_path.get()
 
 
 class LogDisplay(ctk.CTkFrame):