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IME: Render overlay at the last visible cursor position with a separate cursor

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Fix the problem caused by wrong cursor coordinates. No more messing with
the main cursor, instead the cursor is saved when receiving a pre-edit
text update and used for drawing later.

Update the overlay to the last visible cursor position before rendering
to ensure it always moves with the cursor. Finally, draw the overlay
after line rendering is complete, and restore the line buffer after
updating the rendered data to ensure that the line text being read is
correct at all times.

This also improves performance by only rendering once when changes are
made, eliminating the need to repeatedly disable and draw after various
commands and not even comprehensively.
This commit is contained in:
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2023-02-22 22:36:06 +08:00
parent de188faf55
commit 126aaddccb
6 changed files with 213 additions and 154 deletions
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docs/changelog.rst
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@@ -46,7 +46,7 @@ Detailed list of changes
- When changing the cursor color via escape codes or remote control to a fixed color, do not reset cursor_text_color (:iss:`5994`)
- Input Method Extensions: Fix incorrect rendering of IME in-progress text in some situations (:pull:`6002`)
- Input Method Extensions: Fix incorrect rendering of IME in-progress and commited text in some situations (:pull:`6049`)
- Linux: Reduce minimum required OpenGL version from 3.3 to 3.1 + extensions (:iss:`2790`)