add 'min-length' panel property

src/graphics/ui/elements/Panel.cpp

@@ -23,6 +23,14 @@ int Panel::getMaxLength() const {
     return maxLength;
 }
 
+void Panel::setMinLength(int value) {
+    minLength = value;
+}
+
+int Panel::getMinLength() const {
+    return minLength;
+}
+
 void Panel::setPadding(glm::vec4 padding) {
     this->padding = padding;
     refresh();
@@ -34,9 +42,11 @@ glm::vec4 Panel::getPadding() const {
 
 void Panel::cropToContent() {
     if (maxLength > 0.0f) {
-        setSize(glm::vec2(getSize().x, glm::min(maxLength, actualLength)));
+        setSize(glm::vec2(
+            getSize().x, glm::max(minLength, glm::min(maxLength, actualLength))
+        ));
     } else {
-        setSize(glm::vec2(getSize().x, actualLength));
+        setSize(glm::vec2(getSize().x, glm::max(minLength, actualLength)));
     }
 }