Update MSRV to rust 1.59 in the CI and documentation

This is only required for dependencies of slint-build and xtask.
So this is not enforced yet and will still work with 1.56 with
for C++ or when not using slint-build.

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-20.04, macOS-11, windows-2019]
-        rust_version: [stable, 1.56]
+        rust_version: [stable, 1.59]
     runs-on: ${{ matrix.os }}
 
     steps:

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project are documented in this file.
  - On wasm, the input event are handled via a hidden `<input>` element, allowing the keyboard
    to show on mobile platform
  - The size of the window is kept when reloading a window in the preview (instead of being reset to the preferred size)
+ - Minimum rust version is now 1.59
 
 ### Added
 

api/cpp/docs/cmake.md

@@ -30,7 +30,7 @@ The recommended and most flexible way to use the C++ API is to build Slint from
 First you need to install the prerequisites:
 
 * Install Rust by following the [Rust Getting Started Guide](https://www.rust-lang.org/learn/get-started). If you already
-  have Rust installed, make sure that it's at least version 1.56 or newer. You can check which version you have installed
+  have Rust installed, make sure that it's at least version 1.59 or newer. You can check which version you have installed
   by running `rustc --version`. Once this is done, you should have the ```rustc``` compiler and the ```cargo``` build system installed in your path.
 * **[cmake](https://cmake.org/download/)** (3.19 or newer)
 * A C++ compiler that supports C++20 (e.g., **MSVC 2019 16.6** on Windows)

api/rs/slint/README.md

@@ -63,4 +63,4 @@ cargo run --release --bin printerdemo
 
 ### Minimum Supported Rust Version
 
- This crate's minimum supported `rustc` version is `1.56.0`.
+ This crate's minimum supported `rustc` version is 1.59.

api/rs/slint/migration.md

@@ -6,8 +6,6 @@ This guide lists all API incompatible changes between major versions and describ
 
 ## Migrating from Version 0.1.x to 0.2.0
 
-In 0.2.0 we have increased the minimum version of rust. You need to have rust compiler version >= 1.56 installed.
-
 ### Models
 
 #### `Model::row_data`

docs/building.md

@@ -7,7 +7,7 @@ This page explains how to build and test Slint.
 ### Installing Rust
 
 Install Rust by following the [Rust Getting Started Guide](https://www.rust-lang.org/learn/get-started). If you already
-have Rust installed, make sure that it's at least version 1.56 or newer. You can check which version you have installed
+have Rust installed, make sure that it's at least version 1.59 or newer. You can check which version you have installed
 by running `rustc --version`.
 
 Once this is done, you should have the ```rustc``` compiler and the ```cargo``` build system installed in your path.

docs/tutorial/cpp/src/getting_started.md

@@ -6,7 +6,7 @@ In this tutorial, we use C++ as the host programming language. We also support o
 You will need a development environment that can compile C++20 with CMake 3.19.
 We do not provide binaries of Slint yet, so we will use the CMake integration that will automatically build
 the tools and library from source. Since it is implemented in the Rust programming language, this means that
-you also need to install a Rust compiler (1.56). You can easily install a Rust compiler
+you also need to install a Rust compiler (1.59). You can easily install a Rust compiler
 following the instruction from [the Rust website](https://www.rust-lang.org/learn/get-started).
 We are going to use `cmake`'s builtin FetchContent module to fetch the source code of Slint.