The values returned by EM_SETPARAFORMAT and EM_GETPARAFORMAT previously
indicated an error, and the included tests shows that Windows behaves as
documented.
This is a minimal model of what happens in Corman Lisp 3.0 -
subclassed window class that unconditionally calls ShowScrollBar() to
force scrollbar visibility.
Some applications have never heard of ES_DISABLENOSCROLL and attempt
to force scrollbars to be always shown (with ShowScrollBar() or
similar) when otherwise richedit would hide them. If richedit attempts
to wrestle control back, a recursive loop of requests can result if
app overrides WM_SIZE behavior. Apparently native never reads the
scrollbar state, and operates from some sort of internal state, so
that scrollbars can be modified externally without native trying to
wrestle back control. This is confirmed by attached tests. An
exception: EM_SCROLL will restore visibility to a scrollbar that was
forcibly hidden.
EM_AUTOURLDETECT tests are taking too much time, so this patch tests
just one URL and one non-URL for all messages but WM_SETTEXT. Also,
remove one trace that spams the output needlessly.
This also reverts commit 2b52dd845097f16076c0185b02a003f63898dcab:
wordpad: Empty the richedit undo buffer on creation.
The reverted commit I created to fix an issue that only applied to Wine,
but it just masked the issue which was in richedit controls. The
default character format was set in two places while wordpad was
starting up, and caused wordpad to have two undo items at startup.
Before the end of the text was selected when clicking below the end of
the text, rather than using the x position to find the appropriate
character on the last row that is closest to the pixel position.
Consecutively typed characters are grouped together to be undone
together. The grouping of typed characters can be stopped by certain
events that are mentioned in MSDN's remarks on the EM_STOPGROUPTYPING
message, which is also implemented by this patch.
Opening a text file with a NULL terminated character in it was causing
an assertion error after a run was being split due to word wrap.
Windows allows NULL terminated characters to be in the text.
Using Ctrl-RightArrow to move to the start of the next word did not
previously work when at the start of a word. This means that
Ctrl-RightArrow would not work twice in a row since it should move to
the start of the next word.
Default richedit font (System) in Windows causes richedit to report
CFM_BOLD as always set. Switch to Courier New in order to see that
richedit really sets the CFM_BOLD attribute in the correct selection.
As text is inserted, the cursor is moved to the end, and then back to
offset 0. A reordering of operations prevents a WM_NOTIFY from being
sent on cursor being moved to the end, and another by being moved
back to the beginning. If the cursor was not at offset 0, then
exactly one WM_NOTIFY must be sent, for the movement from previous
position to the beginning. With tests to prove this change and the
previous one (modify flag should be off on WM_SETTEXT-caused
WM_NOTIFY).
EM_SETCHARFORMAT with wParam==0 sets default char format and does NOT set modify step flag.
EM_SETCHARFORMAT with wParam==SCF_SELECTION only sets modify step flag when selection is nonempty.
EM_GETMODIFY returns -1, not 1, when modify flag is set.
Tests for the above behavior.
Dylan Smith