Platform: notify about hardcoded WebGL canvas size in verbose output.

Very useful for debugging, because doing that is usually wrong.

doc/changelog.dox

@@ -185,6 +185,12 @@ See also:
     allocation function, which changed signature in 2.0.5 and caused runtime
     failures when `-s ASSERTIONS` was enabled. A public stable API is now used
     instead, see [mosra/magnum#483](https://github.com/mosra/magnum/pull/483).
+-   Because hardcoding canvas size using
+    @ref Platform::EmscriptenApplication::Configuration::setSize() "Platform::Application::Configuration::setSize()"
+    on WebGL is usually a wrong thing to do, both
+    @ref Platform::EmscriptenApplication and @ref Platform::Sdl2Application now
+    notify about that in the verbose output (enabled with `?magnum-log=verbose`),
+    previously only autodetected canvas size got printed
 
 @subsubsection changelog-latest-changes-shaders Shaders library
 

src/Magnum/Platform/EmscriptenApplication.cpp

@@ -404,6 +404,9 @@ bool EmscriptenApplication::tryCreate(const Configuration& configuration, const
     Vector2i canvasSize;
     if(!configuration.size().isZero()) {
         canvasSize = configuration.size();
+        /* Because hardcoding canvas size for WebGL is usually a wrong thing to
+           do, notify about that in the verbose output */
+        Debug{verbose} << "Platform::EmscriptenApplication::tryCreate(): hardcoded canvas size" << canvasSize;
     } else {
         canvasSize = _lastKnownCanvasSize;
         Debug{verbose} << "Platform::EmscriptenApplication::tryCreate(): autodetected canvas size" << canvasSize;

src/Magnum/Platform/Sdl2Application.cpp

@@ -408,6 +408,9 @@ bool Sdl2Application::tryCreate(const Configuration& configuration) {
     Vector2i windowSize;
     if(!configuration.size().isZero()) {
         windowSize = configuration.size();
+        /* Because hardcoding canvas size for WebGL is usually a wrong thing to
+           do, notify about that in the verbose output */
+        Debug{_verboseLog ? Debug::output() : nullptr} << "Platform::Sdl2Application::tryCreate(): hardcoded canvas size" << windowSize;
     } else {
         windowSize = _lastKnownCanvasSize;
         Debug{_verboseLog ? Debug::output() : nullptr} << "Platform::Sdl2Application::tryCreate(): autodetected canvas size" << windowSize;
@@ -636,6 +639,9 @@ bool Sdl2Application::tryCreate(const Configuration& configuration, const GLConf
     Vector2i windowSize;
     if(!configuration.size().isZero()) {
         windowSize = configuration.size();
+        /* Because hardcoding canvas size for WebGL is usually a wrong thing to
+           do, notify about that in the verbose output */
+        Debug{_verboseLog ? Debug::output() : nullptr} << "Platform::Sdl2Application::tryCreate(): hardcoded canvas size" << windowSize;
     } else {
         windowSize = _lastKnownCanvasSize;
         Debug{_verboseLog ? Debug::output() : nullptr} << "Platform::Sdl2Application::tryCreate(): autodetected canvas size" << windowSize;