Fix cursor jumping when editing variable names

src/widgets/variable-data-row.ui

@@ -19,13 +19,46 @@
           <object class="GtkEntry" id="name_entry">
             <property name="placeholder-text">Variable name</property>
             <property name="hexpand">True</property>
-            <signal name="changed" handler="on_name_changed"/>
+          </object>
+        </child>
+
+        <!-- Inline edit buttons (shown only when editing) -->
+        <child>
+          <object class="GtkRevealer" id="edit_buttons_revealer">
+            <property name="transition-type">slide-left</property>
+            <property name="reveal-child">False</property>
+            <child>
+              <object class="GtkBox">
+                <property name="spacing">3</property>
+                <child>
+                  <object class="GtkButton" id="cancel_button">
+                    <property name="icon-name">process-stop-symbolic</property>
+                    <property name="tooltip-text">Cancel editing</property>
+                    <signal name="clicked" handler="on_cancel_clicked"/>
+                    <style>
+                      <class name="flat"/>
+                    </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkButton" id="save_button">
+                    <property name="icon-name">object-select-symbolic</property>
+                    <property name="tooltip-text">Save changes</property>
+                    <signal name="clicked" handler="on_save_clicked"/>
+                    <style>
+                      <class name="flat"/>
+                      <class name="suggested-action"/>
+                    </style>
+                  </object>
+                </child>
+              </object>
+            </child>
           </object>
         </child>
 
         <child>
           <object class="GtkToggleButton" id="sensitive_toggle">
-            <property name="icon-name">channel-insecure-symbolic</property>
+            <property name="icon-name">changes-allow-symbolic</property>
             <property name="tooltip-text">Mark as sensitive (store in keyring)</property>
             <signal name="toggled" handler="on_sensitive_toggled"/>
             <style>

src/widgets/variable_data_row.py

@@ -30,6 +30,9 @@ class VariableDataRow(Gtk.Box):
 
     variable_cell = Gtk.Template.Child()
     name_entry = Gtk.Template.Child()
+    edit_buttons_revealer = Gtk.Template.Child()
+    cancel_button = Gtk.Template.Child()
+    save_button = Gtk.Template.Child()
     sensitive_toggle = Gtk.Template.Child()
     delete_button = Gtk.Template.Child()
     values_box = Gtk.Template.Child()
@@ -44,6 +47,7 @@ class VariableDataRow(Gtk.Box):
     def __init__(self, variable_name, environments, size_group, project, project_manager, update_timestamp=None):
         super().__init__()
         self.variable_name = variable_name
+        self.original_name = variable_name  # Store original name for cancel
         self.environments = environments
         self.size_group = size_group
         self.project = project
@@ -51,10 +55,20 @@ class VariableDataRow(Gtk.Box):
         self.value_entries = {}
         self.update_timeout_id = None
         self._updating_toggle = False  # Flag to prevent recursion
+        self._is_editing = False  # Track editing state
 
         # Set variable name
         self.name_entry.set_text(variable_name)
 
+        # Connect focus events for inline editing
+        focus_controller = Gtk.EventControllerFocus()
+        focus_controller.connect('enter', self._on_name_entry_focus_in)
+        focus_controller.connect('leave', self._on_name_entry_focus_out)
+        self.name_entry.add_controller(focus_controller)
+
+        # Connect activate signal (Enter key)
+        self.name_entry.connect('activate', self._on_name_entry_activate)
+
         # Set initial sensitivity state
         is_sensitive = variable_name in self.project.sensitive_variables
         self._updating_toggle = True
@@ -130,10 +144,45 @@ class VariableDataRow(Gtk.Box):
         )
         self.emit('value-changed', env_id, value)
 
+    def _on_name_entry_focus_in(self, controller):
+        """Show edit buttons when entry gains focus."""
+        self._is_editing = True
+        self.original_name = self.name_entry.get_text().strip()
+        self.edit_buttons_revealer.set_reveal_child(True)
+
+    def _on_name_entry_focus_out(self, controller):
+        """Handle focus leaving the entry without explicit save/cancel."""
+        # Only auto-hide if user didn't click cancel/save
+        # The buttons will handle hiding themselves
+        pass
+
+    def _on_name_entry_activate(self, entry):
+        """Handle Enter key press - same as clicking Save."""
+        self._save_changes()
+
     @Gtk.Template.Callback()
-    def on_name_changed(self, entry):
+    def on_cancel_clicked(self, button):
-        """Handle variable name changes."""
+        """Cancel editing and restore original name."""
-        self.emit('variable-changed')
+        self.name_entry.set_text(self.original_name)
+        self._is_editing = False
+        self.edit_buttons_revealer.set_reveal_child(False)
+
+    @Gtk.Template.Callback()
+    def on_save_clicked(self, button):
+        """Save variable name changes."""
+        self._save_changes()
+
+    def _save_changes(self):
+        """Save the variable name change."""
+        new_name = self.name_entry.get_text().strip()
+
+        # Only emit if name actually changed
+        if new_name != self.original_name:
+            self.emit('variable-changed')
+
+        self._is_editing = False
+        self.edit_buttons_revealer.set_reveal_child(False)
+        self.original_name = new_name
 
     @Gtk.Template.Callback()
     def on_delete_clicked(self, button):
@@ -159,7 +208,7 @@ class VariableDataRow(Gtk.Box):
             self.sensitive_toggle.set_tooltip_text("Sensitive (stored in keyring)\nClick to make non-sensitive")
             self.name_entry.add_css_class("sensitive-variable-name")
         else:
-            self.sensitive_toggle.set_icon_name("channel-insecure-symbolic")
+            self.sensitive_toggle.set_icon_name("changes-allow-symbolic")
             self.sensitive_toggle.set_tooltip_text("Not sensitive (stored in JSON)\nClick to mark as sensitive")
             self.name_entry.remove_css_class("sensitive-variable-name")
 
@@ -172,6 +221,9 @@ class VariableDataRow(Gtk.Box):
         self.environments = environments
         self.project = project
 
+        # Update original_name in case variable was renamed
+        self.original_name = self.variable_name
+
         # Update sensitivity toggle state
         is_sensitive = self.variable_name in self.project.sensitive_variables
         self._updating_toggle = True