fix(compatibility): replace wide characters under cursor properly #1196
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Fixes #1117 (among other things)
The issue above had to do with wide characters overflowing a cached-render. Meaning we would be doing needless extra padding (since we weren't checking for wide characters in that specific case) and not rendering the frame above the padding (since we'd already rendered it before and thought it was unchanged). This fixes it by making the padding wide-character aware.
This fix also includes better wide-character handling when replacing characters under the cursor. Better handling cases where we replace a wide-character with a non-wide-character and vice-versa.