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Fix UI cursor positioning issues.

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Accurately recompute cursor position to prevent drift in terminal and GUI renderers.
This commit is contained in:
Kyle Isom
2025-12-04 15:18:02 -08:00
parent 5ff4b2ed3e
commit 37472c71ec
2 changed files with 37 additions and 5 deletions
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14
GUIRenderer.cc
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@@ -455,7 +455,19 @@ GUIRenderer::Draw(Editor &ed)
}
// Convert to viewport x by subtracting horizontal col offset
std::size_t rx_viewport = (rx_abs > coloffs_now) ? (rx_abs - coloffs_now) : 0;
ImVec2 p0 = ImVec2(line_pos.x + static_cast<float>(rx_viewport) * space_w, line_pos.y);
// For proportional fonts (Linux GUI), avoid accumulating drift by computing
// the exact pixel width of the expanded substring up to the cursor.
// expanded contains the line with tabs expanded to spaces and is what we draw.
float cursor_px = 0.0f;
if (rx_viewport > 0 && coloffs_now < expanded.size()) {
std::size_t start = coloffs_now;
std::size_t end = std::min(expanded.size(), start + rx_viewport);
// Measure substring width in pixels
ImVec2 sz = ImGui::CalcTextSize(expanded.c_str() + start,
expanded.c_str() + end);
cursor_px = sz.x;
}
ImVec2 p0 = ImVec2(line_pos.x + cursor_px, line_pos.y);
ImVec2 p1 = ImVec2(p0.x + space_w, p0.y + line_h);
ImU32 col = IM_COL32(200, 200, 255, 128); // soft highlight
ImGui::GetWindowDrawList()->AddRectFilled(p0, p1, col);