https://bugs.documentfoundation.org/show_bug.cgi?id=156459
Bug ID: 156459
Summary: Windows: WM_UNICHAR message handled incorrectly
Product: LibreOffice
Version: Inherited From OOo
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: LibreOffice
Assignee: [email protected]
Reporter: [email protected]
Using SentMessage utility [1], and WM_UNICHAR message documentation [2]:
1. Create a new text document in Writer;
2. launch SendMessage utility, and drag its "target" tool to the Writer's main
area to find its window;
3. Put '0x0109' (i.e., WM_UNICHAR hex value) to 'Message' box in SendMessage;
4. Put '0x1F34E' (i.e., U+1F34E "RED APPLE") to 'WPARAM' box in SendMessage;
5. Put 0 to LPARAM box in SendMessage;
6. Press [ SendMessage ] button.
Expected result: an apple character in Writer; following Alt+X there should
result in U+1f34e (this should be true, even if no font on system provides the
apple character).
Actual result: a "whitespace" character is shown in Writer; Alt+X there results
in U+df4e (the low surrogate of the correct 'D83C DF4E' UTF-16 surrogate pair).
Wrong implementation of the message support from start, not passing the high
surrogate to the frame.
[1] https://tools.stefankueng.com/SendMessage.html
[2] https://learn.microsoft.com/en-us/windows/win32/inputdev/wm-unichar
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