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Alexandru Băluț authored
Refactored the code to calculate `surface_width` correctly. As a result, removed some handlers which are not needed anymore, along with the `_force_redraw` field. Now when the pre-drawn `surface` is created we store the start, end, zoom, which are checked later in `do_draw` to determine whether a new pre-drawn `surface` is needed. Delayed the conversion of float values to int as much as possible, to avoid small inconsistencies in how we calculate the `offset` at which the `surface` is drawn. Fixes #2195
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