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Improves performance of completion and highlights by minimising the number of highlight requests and GUI redraws (token checking, debouncing, acting on a single response only). Also fixes highlights not being updated on focus/blur.
References
Fixes #432 and fixes #431
Code changes
Added debouncer and multiple checks verifying if we want to ask server for highlights and then if we want to apply those.
User-facing changes
Highlights do not flicker when moving cursor quickly. Completions work slightly faster.
Backwards-incompatible changes
None
Chores