Fix completion in math when inline completion was not yet shown (take 2)

Better version of b4211ef2: we handle the case of a unique completion early.

Fixes bug #12674.

diff --git a/src/frontends/qt/GuiCompleter.cpp b/src/frontends/qt/GuiCompleter.cpp
index 2aee43691231e0b243f28e95f38714a462cbfcfc..01ae3ccec8c120e3f95b0ac1c9de11675861e4b9 100644 (file)
--- a/src/frontends/qt/GuiCompleter.cpp
+++ b/src/frontends/qt/GuiCompleter.cpp
@@ -688,9 +688,10 @@ void GuiCompleter::tab()
        // If completion is active, at least complete by one character
        docstring prefix = cur.inset().completionPrefix(cur);
        docstring completion = qstring_to_ucs4(currentCompletion());
-       if (completion.size() <= prefix.size()) {
+       if (uniqueCompletionAvailable() || completion.size() <= prefix.size()) {
                // finalize completion
-               cur.inset().insertCompletion(cur, docstring(), true);
+               docstring const postfix = completion.substr(min(completion.size(), prefix.size()));
+               cur.inset().insertCompletion(cur, postfix, true);
 
                // hide popup and inline completion
                hidePopup();