LibGUI: Allow SpinBox to set its value with return key

Previously SpinBox did not update on return or changes to the editor.
The widget had to lose focus or be manually incremented. This lets
the editor update on return and now always displays the most recent
clamped value. set_value_from_current_text() will also be useful to
programmatically set SpinBox within layouts whose default buttons
consume return key presses.

Userland/Libraries/LibGUI/SpinBox.cpp

@@ -29,11 +29,7 @@ SpinBox::SpinBox()
             m_editor->do_delete();
     };
     m_editor->on_focusout = [this] {
-        auto value = m_editor->text().to_int();
-        if (value.has_value())
-            set_value(value.value());
-        else
-            set_value(min());
+        set_value_from_current_text();
     };
     m_editor->on_up_pressed = [this] {
         set_value(m_value + 1);
@@ -42,6 +38,7 @@ SpinBox::SpinBox()
         set_value(m_value - 1);
     };
     m_editor->on_return_pressed = [this] {
+        set_value_from_current_text();
         if (on_return_pressed)
             on_return_pressed();
     };
@@ -66,6 +63,7 @@ SpinBox::SpinBox()
 void SpinBox::set_value(int value, AllowCallback allow_callback)
 {
     value = clamp(value, m_min, m_max);
+    m_editor->set_text(DeprecatedString::number(value));
     if (m_value == value)
         return;
     m_value = value;
@@ -73,12 +71,20 @@ void SpinBox::set_value(int value, AllowCallback allow_callback)
     m_increment_button->set_enabled(m_value < m_max);
     m_decrement_button->set_enabled(m_value > m_min);
 
-    m_editor->set_text(DeprecatedString::number(value));
     update();
     if (on_change && allow_callback == AllowCallback::Yes)
         on_change(value);
 }
 
+void SpinBox::set_value_from_current_text()
+{
+    auto value = m_editor->text().to_int();
+    if (value.has_value())
+        set_value(value.value());
+    else
+        set_value(min());
+}
+
 void SpinBox::set_range(int min, int max, AllowCallback allow_callback)
 {
     VERIFY(min <= max);

Userland/Libraries/LibGUI/SpinBox.h

@@ -18,6 +18,7 @@ public:
 
     int value() const { return m_value; }
     void set_value(int, AllowCallback = AllowCallback::Yes);
+    void set_value_from_current_text();
 
     int min() const { return m_min; }
     int max() const { return m_max; }