Add support for setting window size limits for glfw

Add a function to the window which calls the glfw function for fixing
the size limits of the window. This can then be called after window
creation.

Author: rokob

shell/platform/glfw/flutter_glfw.cc

@@ -568,6 +568,7 @@ FlutterDesktopWindowControllerRef FlutterDesktopCreateWindow(
   if (window == nullptr) {
     return nullptr;
   }
+
   GLFWClearCanvas(window);
   glfwSetWindowUserPointer(window, state.get());
 
@@ -736,6 +737,16 @@ void FlutterDesktopWindowSetPixelRatioOverride(
   }
 }
 
+void FlutterDesktopWindowSetWindowSizeLimits(
+    FlutterDesktopWindowRef flutter_window,
+    int minwidth,
+    int minheight,
+    int maxwidth,
+    int maxheight) {
+  glfwSetWindowSizeLimits(flutter_window->window, minwidth, minheight, maxwidth,
+                          maxheight);
+}
+
 bool FlutterDesktopRunWindowEventLoopWithTimeout(
     FlutterDesktopWindowControllerRef controller,
     uint32_t timeout_milliseconds) {

shell/platform/glfw/public/flutter_glfw.h

@@ -52,6 +52,7 @@ typedef struct {
   // Whether or not the user is prevented from resizing the window.
   // Reversed so that the default for a cleared struct is to allow resizing.
   bool prevent_resize;
+  // Optional limits for the size of the window.
 } FlutterDesktopWindowProperties;
 
 // Sets up the library's graphic context. Must be called before any other
@@ -167,6 +168,17 @@ FLUTTER_EXPORT void FlutterDesktopWindowSetPixelRatioOverride(
     FlutterDesktopWindowRef flutter_window,
     double pixel_ratio);
 
+// Sets the min/max width/height of |flutter_window| in pixels. Use
+// GLFW_DONT_CARE to leave a dimension unconstrained.
+//
+// This must be called from the main thread.
+FLUTTER_EXPORT void FlutterDesktopWindowSetWindowSizeLimits(
+    FlutterDesktopWindowRef flutter_window,
+    int minwidth,
+    int minheight,
+    int maxwidth,
+    int maxheight);
+
 // Runs an instance of a headless Flutter engine.
 //
 // Returns a null pointer in the event of an error.