Avoid missing updates after some operations on selection

The logic at the end of Text::dispatch failed when needsUpdate and
singleParUpdate were true at the same time.

src/Text.cpp

@@ -6386,7 +6386,7 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 
 	// FIXME: the following code should go in favor of fine grained
 	// update flag treatment.
-	if (singleParUpdate) {
+	if (singleParUpdate && !needsUpdate) {
 		// Inserting characters does not change par height in general. So, try
 		// to update _only_ this paragraph. BufferView will detect if a full
 		// metrics update is needed anyway.

status.24x

@@ -126,6 +126,7 @@ What's new
 - Fix crash when deleting tabs in a selection (with S-BackTab) in a
   text-only inset (ERT, Listings...).
 
+- Fix display glitches when applying some operations to a selection.
 
 * INTERNALS