examples/: compile with QT_NO_CONTEXTLESS_CONNECT

Examples are usually a good way to get to know a new codebase, do not
teach developers who are new to Qt about the 3-arg connect() to begin
with.

Drive-by changes:
- `this` can't be implicitly captured with [=] in a lambda, instead
  capture by reference
- Update docs related to the sqlbrowser example; the overloaded signal
  it mentions has been removed in Qt6
- In the sqlbrowser example, rename addConnection() (no-arg) overload to
  openNewConnectionDialog, suggested in code review

Change-Id: I30c9f35bda4ac2f460d767ab7f84422ae3ed09f7
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/examples/sql/sqlbrowser/browser.h b/examples/sql/sqlbrowser/browser.h
index cf959703b3e..82702b2ae3c 100644
--- a/examples/sql/sqlbrowser/browser.h
+++ b/examples/sql/sqlbrowser/browser.h
@@ -32,7 +32,7 @@ public slots:
     void exec();
     void showTable(const QString &table);
     void showMetaData(const QString &table);
-    void addConnection();
+    void openNewConnectionDialog();
     void currentChanged() { updateActions(); }
     void about();