fix: update message length when completing (#6856)

When the completer completes, we block all signals. However, we do want
to broadcast a text-changed signal. Since we can't unblock individual
signals, we unconditionally emit a signal after we unblock all signals.

This might come with some side-effects when the user uses certain combinations of settings. I'm merging this in with the hope that these concerns, if any real ones exist, pop up as issues.

Reported-by: 4rneee
Reviewed-by: Mm2PL
Reviewed-by: pajlada <rasmus.karlsson@pajlada.com>

.clang-tidy

@@ -16,6 +16,7 @@ Checks: "-*,
   clazy-*,
   -clazy-qstring-allocations,
   -clazy-missing-qobject-macro,
+  -clazy-incorrect-emit,
   -clazy-ctor-missing-parent-argument,
   cppcoreguidelines-*,
   -cppcoreguidelines-pro-type-cstyle-cast,

src/widgets/helper/ResizingTextEdit.cpp

@@ -181,6 +181,7 @@ void ResizingTextEdit::keyPressEvent(QKeyEvent *event)
                 QSignalBlocker dontTriggerCursorMovement(this);
                 this->completer_->complete();
             }
+            this->textChanged();
             return;
         }
 
@@ -210,6 +211,7 @@ void ResizingTextEdit::keyPressEvent(QKeyEvent *event)
             QSignalBlocker dontTriggerCursorMovement(this);
             this->completer_->complete();
         }
+        this->textChanged();
         return;
     }