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[222_36] 修复数学补全Tab cycling 弹窗位置参考错误 #2722

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[222_36] 修复数学补全Tab cycling 弹窗位置参考错误 #2722

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25 changes: 19 additions & 6 deletions devel/222_36.md
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# 222_36 修复数学补全 Tab cycling 弹窗在大符号后位置异常
# 222_36 修复数学补全 Tab cycling 弹窗在大符号后位置异常

## 如何测试

在 mogan 中插入“数学-单行公式”，输入大算符（如 \\iiint），然后按 `I` `I` `Tab` 触发 tab cycling。弹窗应出现在光标附近，而不会被推到很右侧。
在 mogan 中插入“数学-单行公式”，按 `I` `I` `Tab` 触发 tab cycling。弹窗应出现在光标附近，而不会被推到很右侧。

## 2026/01/28

## 2026/01/30
### Why

Tab cycling 复杂符号时，数学补全弹窗获取光标位置的时序不一致，可能在光标坐标更新前就显示，导致弹窗停留在上一候选的位置。

### What

增加一次事件循环的延迟重定位，等光标位置更新后再移动弹窗，避免因时序不同而偏移。

### How

- `QTMMathCompletionPopup::showMathCompletions` 内新增 `QTimer::singleShot(0, ...)`，在下一轮事件循环重新计算弹窗坐标并移动。


## 2026/01/28
### Why

数学补全弹窗的位置基于缓存的光标坐标计算，在遇到 `math-big-operator` 包裹的大符号时，字形 extents 异常放大，导致 `cached_cursor_x` 极大，弹窗被推到很右侧。

### What

改为优先使用 `QTMWidget` 里真实的光标像素坐标进行定位，并在不可用时回退旧的缓存坐标计算，避免被大符号字形影响。
改为优先使用 `QTMWidget` 里的真实光标像素坐标进行定位，并在不可用时回退旧的缓存坐标计算，避免被大符号字形影响。

### How

- `QTMWidget` 暴露只读的 `cursorPos()` 供弹窗取用。
- `QTMMathCompletionPopup::getCachedPosition` 首选 `cursorPos + origin + surface` 的几何关系计算位置，兜底保留原有计算逻辑。



2 changes: 2 additions & 0 deletions src/Plugins/Qt/QTMMathCompletionPopup.cpp
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#include <QPainter>
#include <QPen>
#include <QTimer>
#include <cmath>

QTMMathCompletionPopup::QTMMathCompletionPopup (QWidget* parent,
Expand Down Expand Up @@ -108,6 +109,7 @@ QTMMathCompletionPopup::showMathCompletions (struct cursor cu, double magf,
raise ();
show ();
this->adjustSize ();
QTimer::singleShot (0, this, [this] () { updatePosition (); });
}

void
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