Now I use FLTK 1.3.7. I test the version 1.3.7 and 1.40 (latest commit), all have the same problem.

The key function fl_set_spot are called twice in Fl_Input_ class (Fl_Input_.cxx), one is in FL_FOCUS handler（1.3.7: line 1011; 1.4.0: line 1021), the other is in Fl_Input_::drawtext (1.3.7: line 414; 1.4.0: line 400). The call in drawtext causes a bug in Fl_Multiline_Input: when inputting multi-line text, move the caret (cursor) to the middle line, the hint bar of IME will appear at the last line. See line 415(1.3.7) or line 401(1.4.0):

  if (Fl::focus() == this) {
       fl_set_spot(textfont(), textsize(),
               (int)xpos+curx, Y+ypos-fl_descent(), W, H, window());
}

The calculation of x coordination (int)xpos+curx is correct. But the calculation of y coordination Y+ypos-fl_descent() is not correct because ypos is changed after drawing the cursor (1.3.7 : line 374-397; 1.4.0 : line 364-383) in a loop (1.3.7 : line 294-401; 1.4.0 : line 288-387).

A solution is listed as follows:

1. Add a local variable in line 294 (1.3.7) and line 288 (1.4.0): int ypos_cur = ypos;
2. Add ypos_cur = ypos+height; in line 394 (1,3.7) and line 380 (1.4.0).
3. Modify line 416 (1.3.7) and line 402 (1.4.0) : (int)xpos+curx, Y+ypos_cur-fl_descent(), W, H, window());

fl_set_spot is not called in Fl_Text_Display and Fl_Text_Editor, so it raises this bug. A solution is listed as follows:

1. Add fl_set_spot(textfont(), textsize(), x(), y(), w(), h(), window()); to case FL_FOCUS in Fl_Text_Editor::handle(...).
2. Add if (Fl::focus() == this) { fl_set_spot(textfont(), textsize(), X, bot, ,... to the end of Fl_Text_Display::draw_cursor().

I find Fl::insertion_point_location is called in Fl_Input_::drawtext and Fl_Text_Display::draw_cursor, but only Fl_Cocoa_Screen_Driver::insertion_point_location is implemented.

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