Fix picking warning and update_axis_camera (#2352)

* fix picking warning for WGLMakie

* preserve type for heterogenous input types

WGLMakie/src/events.jl

@@ -105,7 +105,3 @@ function connect_scene_events!(scene::Scene, comm::Observable)
     end
     return
 end
-
-function Makie.pick(scene::Scene, THREE::ThreeDisplay, xy::Vec{2,Float64})
-    return @warn "Picking not supported yet by WGLMakie"
-end

src/interaction/events.jl

@@ -60,6 +60,11 @@ Picks a mouse position.  Implemented by the backend.
 """
 function pick end
 
+function pick(::Scene, ::Screen, xy) where Screen
+    @warn "Picking not supported yet by $(parentmodule(Screen))" maxlog=1
+    return nothing, 0
+end
+
 """
     onpick(func, plot)
 Calls `func` if one clicks on `plot`.  Implemented by the backend.

src/makielayout/blocks/axis.jl

@@ -95,6 +95,7 @@ function update_axis_camera(camera::Camera, t, lims, xrev::Bool, yrev::Bool)
     bottomtop = yrev ? (top, bottom) : (bottom, top)
 
     projection = Makie.orthographicprojection(
+        Float32,
         leftright...,
         bottomtop..., nearclip, farclip)