[BUG] Relative positioning of annotations tuple cannot mix integer and float

[chunjiw]

Details

Change the MWE in #3634 such that the relative position is (1, 0.5) or (0.5, 1) leads to error like

Failed to show value:

MethodError: no method matching locate_annotation(::Plots.Subplot{Plots.GRBackend}, ::Tuple{Float64, Int64}, ::Plots.PlotText)

Backends

This bug occurs on ( insert x below )

Backend	yes	no	untested
gr (default)	x
pyplot			x
plotlyjs			x
pgfplotsx			x
unicodeplots			x
inspectdr			x
gaston			x

Versions

Plots.jl version: v1.31.1 Backend version (]st -m <backend(s)>): GR v0.64.4 Output of versioninfo():

Julia Version 1.7.3
Commit 742b9abb4d (2022-05-06 12:58 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Core(TM) i7-6850K CPU @ 3.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, broadwell)