meta_project: don't double invoke increment methods

The `increment` methods of the subobjects are invoked
from QML, so don't also invoke them from Rust.

This also makes the behavior of the application clearer:
Main counts by 1, Sub1 counts by 2, Sub2 counts by 3.

Author: Be-ing

examples/meta_project/rust/main/src/lib.rs

@@ -4,3 +4,9 @@
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
 mod main_object;
+
+// Ensure the symbols from the rlib dependencies end up
+// in the staticlib (if you use Rust symbols from these
+// crates in this crate, you can skip these `pub use` statements).
+pub use sub1;
+pub use sub2;

examples/meta_project/rust/main/src/main_object.rs

@@ -34,10 +34,7 @@ pub struct MainObjectRust {
 
 impl qobject::MainObject {
     pub fn increment(mut self: Pin<&mut Self>) {
-        let counter = self.rust().counter;
-        let counter = sub1::increment(counter);
-        let counter = sub2::increment(counter);
-        self.as_mut().rust_mut().counter = counter;
+        self.as_mut().rust_mut().counter = self.rust().counter + 1;
 
         let new_string = QString::from(&self.rust().counter.to_string());
         self.as_mut().set_string(new_string);

examples/meta_project/rust/sub1/src/lib.rs

@@ -9,5 +9,5 @@
 mod sub1_object;
 
 pub fn increment(number: u32) -> u32 {
-    number + 1
+    number + 2
 }

examples/meta_project/rust/sub2/src/lib.rs

@@ -9,5 +9,5 @@
 mod sub2_object;
 
 pub fn increment(number: u32) -> u32 {
-    number + 2
+    number + 3
 }