Zufu Liu

Full fixed by 8671ed51f64de38b892364c4a9d521a57ea4aa9e, may still have minor code changes after the change been backported into Scintilla.

Scintilla is going to draw the reverse arrow cursor (based on `C:\Windows\Cursors\arrow.svg`) with code similar to 185311d3ac339f473ee7a8eb8dfe8d0e301b7f35 and 1291ba387b20971b136cd3f62e39e840ee79a98e, the drawing code can be enabled by set line 2874 to...

When porting lexers from Notepad2, `SafeGetCharAt(pos)` should be replaced with `SafeGetCharAt(pos, '\0')`, see https://github.com/zufuliu/notepad2/blob/main/scintilla/lexlib/LexAccessor.h#L92

Not a bug, see https://sourceforge.net/p/scintilla/bugs/2333/

Just fixed (or work round) the same bug in Notepad2 by disable `WM_SETREDRAW` and `InvalidateRect` for statusbar updating on typing. Similar change may fix the bug in Notepad3.

Works after disabling multiple selection (by default when Ctrl is hold, selecting will adds new green caret): 

Reproduceable with SciTE (set `ime.interaction=0`), temporary workaround is using inline mode IME.  Adding a breakpoint after `case WM_IME_COMPOSITION:` seems hide the bug.

The crash is due to `ImeOnDocumentFeed()`, no crashes after comment out `if (wParam == IMR_DOCUMENTFEED)` block: https://github.com/zufuliu/notepad2/blob/9399a27265622ae8409761f549e29f6b9dde073a/scintilla/win32/ScintillaWin.cxx#L1925-L1933

Reported as https://sourceforge.net/p/scintilla/bugs/2433/, please use inline mode IME for now.

> By the way, I wanna know how you located the bug location, could you please give me some advice? First, I guess its stack buffer overrun, then added some...