add resize_fixed() function for widgets

src/Widget.cpp

@@ -41,6 +41,23 @@ bool Widget::resize(double width, double height) {
     return true;
 }
 
+bool Widget::resize_fixed(double width, double height) {
+    if (m_rect.width() == width && m_rect.height() == height)
+        return false;
+
+    if (width < 0 || height < 0)
+        return false;
+
+    m_rect.set_max_width(width);
+    m_rect.set_max_height(height);
+    m_rect.set_min_width(width);
+    m_rect.set_min_height(height);
+    m_rect.set_width(width);
+    m_rect.set_height(height);
+    reflow();
+    return true;
+}
+
 void Widget::move_to(double x, double y) {
     if (m_rect.x() == x && m_rect.y() == y)
         return;

src/Widget.hpp

@@ -48,6 +48,7 @@ public:
 
     void move_to(double x, double y);
     bool resize(double width, double height);
+    bool resize_fixed(double width, double height);
     bool resize(Point &point) { return resize(point.x(), point.y()); }
 
     std::vector<std::shared_ptr<Widget>> &children() { return m_children; }