Add TEXT and LINE_COUNT flags to SCN_UPDATEUI

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When investigating slow performance in applications that use Scintilla, 
excessive notifications are often the cause.

Applications often monitor SCN_MODIFIED to see if something has changed in 
Scintilla but, since these notifications may be fired intensely for some 
operations like replace all, they may cause a significant performance cost.

SCN_UPDATEUI fires on idle after modifications have occurred so can 
coalesce the effect of many SCN_MODIFIED events and thus perform better.

When implementing features like URL highlighting or spell checking, 
applications want to know when the text has changed. 
Currently, SCN_UPDATEUI reports SC_UPDATE_CONTENT for text changes but also 
for many other changes such as styling. If the feature is costly to perform 
then it shouldn't be run again for non-text changes. An SC_UPDATE_TEXT flag 
for SCN_UPDATEUI may improve this.

Applications may have a line number margin that widens or narrows depending 
on the number of digits needed to display all line numbers. 
A SC_UPDATE_LINE_COUNT flag for SCN_UPDATEUI can improve performance for 
this feature.

Both of these flags are trivial to calculate and no more notifications 
occur as they are just adding on to existing SC_UPDATE_CONTENT messages.

With these additions applications may be able to set the modification mask 
to receive fewer SCN_MODIFIED notifications or even none.

Are there any other events that are detected with SCN_MODIFIED that would 
be easy to summarize as SCN_UPDATEUI flags?

Neil

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<div>When investigating slow performance in applications that use Scintilla=
, excessive notifications are often the cause.</div><div><br /></div>Applic=
ations often monitor SCN_MODIFIED to see if something has changed in Scinti=
lla but, since these notifications may be fired intensely for some operatio=
ns like replace all, they may cause a significant performance cost.<div><br=
 /></div><div>SCN_UPDATEUI fires on idle after modifications have occurred =
so can coalesce the effect of many SCN_MODIFIED events and thus perform bet=
ter.</div><div><br /></div><div>When implementing features like URL highlig=
hting or spell checking, applications want to know when the text has change=
d. Currently,=C2=A0SCN_UPDATEUI reports=C2=A0SC_UPDATE_CONTENT for text cha=
nges but also for many other changes such as styling. If the feature is cos=
tly to perform then it shouldn't be run again for non-text changes. An SC_U=
PDATE_TEXT flag for SCN_UPDATEUI may improve this.</div><div><br /></div><d=
iv>Applications may have a line number margin that widens or narrows depend=
ing on the number of digits needed to display all line numbers. A=C2=A0SC_U=
PDATE_LINE_COUNT flag for=C2=A0SCN_UPDATEUI can improve performance for thi=
s feature.</div><div><br /></div><div>Both of these flags are trivial to ca=
lculate and no more notifications occur as they are just adding on to exist=
ing SC_UPDATE_CONTENT messages.</div><div><br /></div><div>With these addit=
ions applications may be able to set the modification mask to receive fewer=
=C2=A0SCN_MODIFIED=C2=A0notifications or even none.</div><div><br /></div><=
div>Are there any other events that are detected with=C2=A0SCN_MODIFIED=C2=
=A0that would be easy to summarize as SCN_UPDATEUI flags?</div><div><br /><=
/div><div>Neil</div>

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