fix: incsearch flickering when typing characters during search #1305
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Setting the decoration provider on every renderer:draw() command caused flickering of incsearch highlights when showing completions for / and ? search modes on the cmdline as characters were typed.
Decoration providers only need to be set once and they remain active, so the fix here is create it when the renderer is created and remember the last bufnr that was drawn to, along with the columns.
Fixes #1061