Please find below a Geany Lua plugin to perform this useful task:

-- Transpose characters on either side of the cursor
-- Philip R Brenan at gmail.com, www.appaapps.com, 2019
-- Perl Artistic License
local s = geany.text()
local c = geany.caret()
local l = string.len(s)
local s1 = string.sub(s, 1, c-1)
local s2 = string.sub(s, c, c)
local s3 = string.sub(s, c+1, c+1)
local s4 = string.sub(s, c+2)

geany.text(s1..s3..s2..s4)
geany.caret(c)

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